I don't think Lesnar will even be in the tournament, even with the lack if star power. First off, they're paying him a bunch of money and I think part of that is based on the amount of matches he is supposed to wrestle.
They might be able to pay him enough to wrestle, but if he has to wrestle 3 matches in one night. Are they going to pay him triple his normal rate for it? I don't know if they're that desperate.