Pietro is the shark. I'm convinced. The multiverse is the red herring.
TBH at this point. i wonder whether he is the red herring but not for the way people think. i mean going by the writing. he isn't being written enough to make audiences think he is the Foxverse character. they haven't done enough to create a scenario that can be pulled the rug out from. he certainly is similar in personality to FOX Quicksilver, but the writing depends on him having the memories of MCU quicksilver which just makes it seem easily odd, confusing and suspicious. so it would almost be abit predictable if the turned out to be "the shark" because this is what many seem to be waiting to find out.
Fans are looking for this stuff, the producers probably know fans are looking for this stuff. so would they really make the clues stand out? or would they attempt to hide it far better? or are the clues all a fake out?
Thing about pietro is that, as a plan, its not a very good one. if you are gonna try and trick wanda would you go disguise yourself as her brother with a different face? why a different face? powers are similar, hair is kinda similar. i mean she knows he has a different face so it really counts on her accepting it and not rejecting it. its a very flawed concept. and i think there is a reason for why he has a different face that they haven't got into yet.
I don't think the multiverse is a red herring. its on its way in about 3 episodes. too coincidental. i think its possible someone could be behind this Quicksilver. but i think there is gonna be a connection towards the multiverse here. even if it turns out someone is able to manipulate the multiverse and do whatever they want with those in it.
The first movie could have Magneto (or whoever villain they choose to use) create an incident too big to cover up and Xavier would have to come clean about Mutants. You could use Cyclops as an "entry point" for the viewer with him returning to the mansion after a sabbatical to lead the team. I don't think it's a stretch to think that the general population would be scared to death and prejudiced against them.
But why would Xavier be hiding them? it works in a Mutant world where discrimination is a thing. otherwise he is just hiding mutants because... they are mutants? while he watches the news and see's all these heroes with powers around, but he is like nah they ain't mutants, they safe bruh!
And with the comics. remember X-Men was one of the first Marvel comics created. so alot of this later stuff was kinda written around Mutants. the MCU is gonna be complete opposite. Mutants are gonna have to be written around the MCU. just like Spider-man was written and continues to be written round the MCU.