You lose all credibility when you make statements like this. I know the Lions like Mitchell, and he probably would have gone in the 3rd if he'd been healthy, so he's a decent prospect, but he has no outstanding traits, so his ceiling is probably a #2.
Wright and Zylstra are both bottom of the roster players who have complementary traits (to each other), okay as a stop gap but offer no competitive advantage, and the NFL, like most sports, is a game of mismatches, the team who can create the most generally wins.
Sure, you can get by with mediocre, and it isn't feasible to be dominant at every position, but generally, talent rules.