I've been reading quite a few thoughts about using the southern California trifecta (Baldy, San Gorgonio, San Jacinto) as prep for Whitney, all of which are helpful. I'm assuming most people think of them as prep for the trail from Whitney Portal. Any thoughts on how good they are as conditioning hikes for the Mountaineer Route? We've done all three lately with good results, no problems with altitude or fatique.
Also, I spoke to an employee at REI yesterday about doing MR in a day. He said he's done it twice as overnighters and was dubious about doing it dawn to dark. However, it seems I've read too many posts here from people who've done it as a dayhike, so I pretty much took his opinion lightly, but I just wanted to confirm what I've heard here.