QB's have high utilization rates, especially in college, especially if you're dual threat. If utilization/stats is your only criterion then literally only QB's can ever be in the discussion as best player. Is Charles Woodson a better player than Flowers? Not based on utilization or stats. But, he's an all-time great corner in football history.
"Highest utilization" is not equal to "best". There's a reason Mack was our highest drafted offensive player in history and a reason why Flowers probably won't be drafted at all. Likewise, there's a reason Jenkins was a 1st rounder and pro bowler. He'd never get the "utilization" of a Flowers while playing at CB, but his mere presence stopped people throwing to an entire side of the field. Even though Trae Williams put up better "stats" because that's the direction the ball went.
There's more to "best" than stats. But, yes, Flowers is our "best" statistical player. That's not the same as the most talented, the most skilled at his position relative to his peers, the most likely to succeed post-USF, etc. Mack and Jenkins very obviously held more of those qualities than Flowers does, IMHO.