Lets say when originally designed in the "ori" galaxy. The milkyway class gates could travel a distance of 8 times the distance of milkyway to pegasus at that time. The universe has expanded the distance is now much greater than when the gates where firat designed. Lets say now it can only travel up to 2 distances of milkyway/ pegasus. In a certain amount of time it will never be able to travel that distance.
Although the pegasus class gates may be an inbetween they are still primative compared to an ori class (milkyway class gate).
Meaning there was likely 2 designs from ori galaxy; a milkyway class gate, and a universe class gate. The pegasus class gate found in pegasus and also by the tollan. Meaning the tollan could still potentially travel both 6 galaxy distances and 1-unlimitde solar system distances.
It is highly likely that the nox also have the pegasus style gate design, but the ori never got it. As it is the most advanced gate although still will suffer the same results as a milkyway gate, just at a much later time.
Potentially a pegasus style gate may combine a universe gate (also called a supergate) and a milkyway gate abilities. Meaning not only does it have unlimited power absorption, but also can have a full range. Mind you the pegasus style gates where designed by the ancients while occuping the pegasus galaxy. As of that time, no intelligent life existed in the pegasus galaxy. The ancients decided to move from their settlements to include tera fire and tera atlantis (earth) and the other solarsystems that inhabited, only after discoverying the pegasus galaxy had no territory claims. Meaning potentially in the milkyway atlantians where limited to a few hundred solar systems but in pegaus they had the whole galaxy of solar system reaources.
The azgard's where elimated by the same virus that took out the atlantians, however they decided to clone their bodies, download their minds to a computer to elimate the virus. The nox, for some reason where never affected. Meaning that although they where a member of the 4 races, they communicated with the anciets before the last ship arrived from the ori galaxy, than took to isolation. Where the azgards being very curious took to their tail. Now imagine in SGU that the alien race that follows destiny everywhere looks very similar to the ancient azgard body design found in SG1 by the azgards. They have been able to evolve becasue that group of azgards have been following destiny from the begining. They where never effected by the virus as the virus had arrived from the ori galaxy thousands of years later. Now some of the last people who left the ori galaxy where also found in atlantis in its last days. How can that be? Yes atlantians lived very long lives, yes they had stasus pods, and yes stasus pods with the fontain of youth could extend further, but how could even with that they be alive 1 million years later? Because they were not alive a million years before. They where born much after destiny was ever sent out, the virus only came to atlantis and milky way shortly after being defeated by the wrath, but before all evacuation of atlantis.
Aka why they still had universe class communication device. How would the ori effect the last altorins with the virus? By effecting everyone. The reason why the ori, eventually had to ascend was the same reason why the ancients did. They effected them selves. Essentially they suicide bombed the altorans.
Their is 3 groups of the azgards. The first group is those who follow the ship destiny and never where effected by the virus. The secound group is those who where effected by the virus that divides into 2 groups. The azgards eventually found one of their ancestors did some genetic modifications, but that ancestor was effected by the virus. The genetic minipulation changed the virus where they had a disease. They decided to download their consecience permeantly onto the azgard computer held by SG1. The final group stayed away from the upgrade body their for do not have the mutated virus that the thor had. They where seen in stargate atlantis. That final group has a better chance of continued living in the physical relm if they can get the dna of the azgards following destiny. Although it maybe possible to do the same with the computer based azgard consiscence it is likely more difficult to do.
The ancients traveles 10,000 years to settlement in the milkyway. Every galaxy they traveled to they found advanced life, yes not as advanced as them. Somewhere as tilk deacribed the gaulded or slightly less advanced. But still capable of galaxy class travel although perhaps taken as long as star trek, warp 3 travel.
The atlanians eventually gave up their search, settled on milkyway, and the 3 other's also less advanced who some may still be less advanced as others they found continued the journey to follow the ancients. Perhaps the azgards where amoung the first. But inorder the ancients where listed as last by the azgards, if the order of speaking is reversed, than the order would be the last the azgard said ancients following in sequencal order to the first.
Than finally after they launched destiny they found what they gave up on finding, the pegasus galaxy, a young galaxy with no intelligent life.
They eventually found a pariste that latched onto an ancient. They either put the ancient or the creature into the evolution machine. Either way they both had the dna of both. Similar to the case of the azgards the evolved form became combined and different from either. The azgard thor had a virus because the orivirus became evolved with the ancient azgard dna making a mutated combonation. Now the azgard would have likely achieved this by timperal minipulation than by genetic mutation. The original virus would not effect anyone without a consensens. Over time although speed up time of causing recombinations the virus became part of the dna, at least part of the virus became part of the dna. At least one mutation of their new body was caused by the virus.
The azgard once they had a near sutable body only had to do limited choosen upgrades. Each cell of their brain could store so much knowledge. They only increased the size of the brain to store more, perhaps even storing it throughout.