Just had a thought!!! What if Void Stiles comes back in season 5b because he's an chimera, because in season 3b Lydia said that Void couldn't be a wolf and a fox but after season 5a we've found out that he can, but the only way that he can is if he's a chimera!!!!!
Btw I don't mean the way Theo said that Stiles still has Voids power, I mean that when they split the Nogitsune and Stiles up in to two body's, the Nogitsune one that took the shape of Stiles might be back!!