This is a great point. Too many fans react to a player one or two years and trash the guy. I've seen guys play like crap for us, fail to make the team at a weak position, move elsewhere, and excell. Happens all the time.
What this team has needed is some good coaching over the course of 3-4 years. I don't think they got that fundamental coaching from Wannstedt and Wise.
McKinney has always been pretty tough - at A&M and his rookie season he did well at OG when he subbed a couple of times. But, he seemed to struggle with the Center position from the mental side - which simultaneously hindered his physical play.
Even if he becomes an average center, it will improve the position signifcantly from the past 5-6 years.