Yeah, but the pick of the litter gets thinner by the minute in the scramble...not everybody is going to wait for that one spot to make up their mind and risk end up holding the bag. If you've decided to move on and get offered some, any spot, you take it asap...you don't tell some Gen Surg chairman "gee...I wish I could take the gen surg internship at UCSF but let me wait on lil UCLA Harbor to get back to me, and I'll get back to you." Really?!
When a spot goes unfilled, all the PD should care about finding somebody reliable who he knows will round out the class and get the job done. At that point, there's no need/place for paralysis by analysis. And obviously, finding one (still pretty daim) overqualified contender can be accomplished pretty quickly...such as in the first hour of the scramble.