He has more LB's in the NFL, drafted, then Bronco has total from both offense and defense since he has been coaching at BYU.
And Sitake's defense has been right at Bronco's numbers also... last year was Sitakes worst defense, and it was really bad too. Sadly this years BYU defense will be much worse than Sitakes was last year.
I don't know how good Sitake will be as a HC... but considering BYU's options, I think it's smart to start at least grooming him now.