There will be some who express concern over his physical dimensions, but Chris Robison is a great prospect whose size ("only" 6'1" 183 lbs) will not be a factor in his success or lack thereof at OU.
With Kendall, Murray and Robison around, the 2017 competition for the starting job will be something to watch.
Right now, however, OU must keep Mayfield healthy and develop Kendall immediately to be a capable backup.