I agree with motherlove and shruggy, illusion is far more dangerous than protean. The problem with illusion imo is that it's no longer stuck to Zoroark. In standard you at least know something could be an imposter because you see Zoroark in the team preview, so you can prepare for it somewhat. But here literally ANYTHING could have illusion, and it doesn't have to be stuck with Zoroark's meh stats.
There are some cases where illusion can almost GUARANTEE 2 pokemon ded. How? Well imagine Gengar impostered to something like raikou, Gengar gets the kill on something, then the adaptability espeed user comes in. Guess what, the adaptability user ded as well, and the player couldn't do anything about it unless they somehow knew or predicted it had illusion. For all they know the Gengar could have some kind of sheer force set.
That's why i think Illusion should have higher priority over protean.
There are some cases where illusion can almost GUARANTEE 2 pokemon ded. How? Well imagine Gengar impostered to something like raikou, Gengar gets the kill on something, then the adaptability espeed user comes in. Guess what, the adaptability user ded as well, and the player couldn't do anything about it unless they somehow knew or predicted it had illusion. For all they know the Gengar could have some kind of sheer force set.
That's why i think Illusion should have higher priority over protean.