There are a few issues with this, and all of them represent a huge problem here.
1) Patrick O'Brien isn't remotely ready to go. This, after enrolling early, spending two springs, and one full season, including two summer workouts, in the program under this OC, the alleged "Quarterback Whisperer."
2) O'Brien is ready to go, but the coaches think he'll get killed behind this O Line. Which is a huge problem pointing at Cavanaugh.
3) O'Brien is ready to go, they're not that worried about the O Line, but they think Lee is really the guy to lead us this season, meaning we have another Sam Keller situation on our hands.
4) The coaches see no benefit to letting Lee view a series or two from the sideline to get his bearings. This is patently false, though.