What would happen if Riot did to Kassadin the same thing that Marvel did to Captain America?

It'd be almost as dumb a twist as Marvel's but that's about it.

I'd do what the Marvel fans should be doing and wait for it to be explained apon before getting angry.

considering that the Void does not equal the Nazis like Hydra does...

However! Void Kassadin is an interesting prospect; based on the creatures and magic we've seen come out of the void I think it's safe to say the Void has one purpose: consumption. So, if it's slowly consuming Kassadin? Maybe it's(or malz) using his corpse b/c his mind and spirit were finally torn down. Maybe his mind has been so touched and tainted and twisted that turning to the void is the only thing Kass thinks he can do.

Whereas making Cap Hydra is just a shitty, disgraceful way to shock viewers.