While scores of candidates isn't ideal, one or two would be worse because Davis would be able to use his proven-successful strategy (aka puke politics) of demonizing his opponent. With multiple opponents, he'll have more difficulty focusing only on the frontrunner. Also, more voters will find a candidate they really like, so that more voters would vote to recall Davis.
Not all of those who declared their candidacy will actually run, if they decide they don't have a chance. We'll see next week. After a few public opinion polls, the rest of the undecided public will choose between the few candidates with a real chance, and some more candidates might drop out of the race along the way.