Yeah, part of me hopes that McKenzie doesn't have the same gene as Trent Edwards, Nate Peterman, RayRay McCloud and others who would do well in training camp, but then have issues during game time.
To clarify we know McKenzie has a bunch of tools at WR (I'm not worried about him there), but I believe he has looked good in the past at ST's during training camp only to have more of a challenge during the regular season.