So you're going to trade one of the only consistent scoring wingers that the Ducks have spent years developing and who wants to be a leader on the team for, checks notes, a lottery ticket? In fact, you want a mid 1st round pick that statistically has low odds of every becoming as good as Terry. Furthermore, that player will take years before we even know if he'll be an NHL player, let alone a good one. The timing is absolutely awful for this core.
Finally, assuming he'll be bad in the playoffs with zero evidence is ridiculous. As a young player, he proved his worth at World Juniors. This talk of he's not a playoff guy is just nonsensical and not worth discussing until he has a chance to prove himself. I guess only large, physical players win in the playoffs and guys like Selanne, Kariya, McDonald, Koivu, etc... are just scrubs.