Tanev doesn't bring the size that O'Connor does at all. I don't see how Tanev fits the profile.
O'Connor is big and fast, plays all three forward positions so he's a Swiss army knife for the bottom six and he's been a proven scorer at the AHL level.
Tanev has good wheels and works hard like O'Connor, but he doesn't bring any of the physical element and I don't think he has any unlocked offensive potential but I suspect O'Connor does.
You don't know what you're talking about.
If every team had a 6'4 speedy forward who can slot in at centre or the wing and scored 16-goals in the NHL last season down on their farm team, then every team in the NHL would have a wildly incompetent General Manager for having that player in the AHL.