What I don't understand, is when Barry lost his memory and never became savitar wally lost his powers. Now that he never becomes savitar will that affect wally's powers?
barry was never gonna be come savitar. savitar just wanted barry in despair . and the writer's have this bad habit of saying if the heroes kill the villain they become, them like what joker want's with bat man.
don't read too much into that part.
savitar is a time remanent from a reality that was formerly part of barry present, but is no longer apart of it due to certain action. and you can only pick them up from the speed force with a portal to their reality, and by asking for their help and they have to say or no.
and it's clear why wally lost his powers he was hit with the same energy with Jessi, but as we saw it with cisco and we saw it with jax Jefferson Jackson and every other character that was hit by an accelerator explosion their body take their time to get their powers. it's like when people are hit with an illness some people take longer then others to get the effect's / sick from it while other get it right way. showing symptoms.
but this isn't an illness. it's not hard to get. their powers take their time to get to maturity while other like Jessie get it right away..
the stone just rushed the process for Wally. so Wally's powers went back to incubation mode. since it was the stone that sped up the process for wally .
the point is savtar 's past self had yet to be called from the speed force . cause barry didn't call them for the battle to allow savitar to exist. that one time Remanent he allowed a live is savitar.
With barry's memory loss it cancels that event and cancels the event of the Philosopher's Stone /the prison that contained savitar, from happening cause barry didn't seek the scientist that made it yet out to create it so he can use it to lock savitar up in that stone and can't all due to memory loss .
so in wally powers won't be sped up all due to this. in order for wally powers to be sped up instead of taking it's time to emerge like it did for the others Savitar needs to have existed. other wise it take it's time to come out naturally. which can take month's to full year if not right away. and wally got his power due to his own impatience's and the stone's Existence .