This question has bothered me since I learned about the Bad Batch. They are a group of positively defective clone commandos. Were they defective enough to not have an inhibitor chip placed in them at birth? The same goes for the clone 99. Also, with the big explosion that Echo was in, do you think that he would still have a working inhibitor chip?
The Bad Batch was designed as part of Kaminoan experiments in creating super-soldiers. According to the Databank:
During the creation of the clone army, the Kaminoans made genetic experiments in an attempt to create super soldiers. While the plan never quite worked, four of those experiments came to form Clone Force 99, or, as they called themselves, the Bad Batch.
As such, they, more than any other clones, would need inhibitor chips to ensure compliance. It seems almost certain that (as with any other clones that were intended to serve in combat), the Bad Batch were implanted with inhibitor chips.
Similarly for the clone that the unit was named after. He seems to have been an ordinary clone for whom the cloning process went wrong. He probably would also have been implanted with an inhibitor chip.
As for Echo, let’s keep in mind that these inhibitor chips were designed for an army of millions of clone troopers—in other words, soldiers. They were expected to encounter explosions, blasters, missiles, slugthrowers, and various other lethal situations. It seems unlikely that this sort of trauma would reliably disable the inhibitor chip, given that a large percentage of the clones could be reliably assumed to have encountered similarly severe physical trauma.