Cal doesn't redshirt, but Lee should have last season, IMHO.
Then Cal would not have felt compelled to "platoon". He could have rotated his 8 draft guys(then 7 once Poy was injured or insert Ulis as number 8). Would have tightened up the rotation and we wouldn't have played guys out of position as much. It would have given the top 8(then 7) more minutes.
Doesn't really matter now, but I think it would have helped last season.
Just thinking out loud.
If he would have redshirted he simply goes pro as a redshirt sophomore instead of a junior most likely. Its hypothetically possible he stays four years, but I couldn't see a situation where he stays five years (i.e. redshirt senior). If Lee gets 20+ minutes this year it would seem likely he will declare for the draft.
If anyone should have been redshirted I'd argue Hawkins or Willis, but as you stated, Cal doesn't do it so its a mute point.