Doug Baldwin was an exception. Most fans understand that for every such example, there are plenty more Kris Durhams, Chris Carters, Kevin Norwoods, Chris Matthews, and Kasen Williams that make a few splash plays in special circumstances but don't cut the mustard on special teams, don't do squat on the plays they take off, and generally don't outperform the cumulative work of steady performers.
The Keenan expectations are unwarranted. If he makes the roster, it will still have been unwarranted, and all HB and his flock will legitimately be able to claim is having made a lucky guess.