Kershaw may only be up for a few weeks and even then may not be in the rotation, Scherzer got called up not because of injuries, but because he had 38 k's in 23 innings. He has always been dominant in the minor leauges, except for a stint last year when he seemed to have an injury, but besides that he has been untouchable and has put up some ridiculous numbers. Take the guy who is in the league now, if you want Kershaw later you can trade for him, but i wouldnt hold my waiver for a guy that i dont think will be up in the near future. Scherzer will be in the rotation for sure as soon as an injury occurs to one of the SP, Kershaw could be, but that is not for certain.
PS-if this is a keeper league, maybe wait on kershaw, long term he is the best prospect of the year by far in my mind.
Reyes and guerrero, the two most blessed players in the league, not to mention the most fun to watch