Not wrong, I had been asking this exact same question as I progressed through the season too. I think what is happening is that some progressed with their abilities whilst others didn't. Like we can see with Diego only dodging the bullets physically in the first episode, whilst in the last episode he's seen being able to literally halt and redirect the bullets. Seeing as they were in the same point in the timeline, perhaps (and this is a reach) they had gone through different experiences which activated different potentials of their powers.
To answer a question on further "proof" of this occurring.
Vanya shows significant ability to control her power at a small scale in the episode where meeting Hargreeves. Diego had only been shown to be able to dodge and redirect relatively sizeable objects. My assumption is that they had to be pushed to unlock these abilities. I imagine that Alison would have had several alternate stresses without her family around during the Civil Rights movement so that may have unlocked the ability for her rumours to be taken literally. As the new TL meant she missed some key moments, she might not have unlocked them.
I can't explain Luther's mishap with the Rocket other than to say it might be to do with surface area.
But essentially, no there's no real definitive proof, I can just theorise