#1 never is unprepared due to lack of reps, unless he suddenly becomes #1 and didn't get reps when he was #2 or 3.
different QBs should get reps, and at full speed with contact, because that's the only, i repeat ONLY, way you can credibly evaluate who should be 1, 2, and 3.
not all practice needs to be full speed full contact, but enough to credibly evaluate different QBs with different skill sets, does.
i railed on this here all last spring and summer, and in past yrs.
by far our highest ceiling QB languished at 3 all yr because the coaching staff never properly vetted our QB room, stubbornly refused to rethink things no matter how much that policy totally failed, and went solely on who threw the prettiest ball in drills.
and it flushed the entire yr down the drain, on top of being very unfair.
mistakes happen.
"stubborn" is the refusal to correct them, or even try to, which is why "stubborn" is among the worst traits any leader can have.