What I was trying to say in my long, convoluted post was that no pitcher with a high ERA/WHIP is guaranteed a lot of saves, so don't go into the draft expecting a guy like Wilson to notch top 10 saves numbers.
In any case, it's all about balancing your numbers. One Wilson won't hurt if you have a Capps to balance him out, but getting two Wilsons in trying to catch up on saves late in a draft is a bad idea unless you're very confident in your starting pitching. At that point I'd just save a couple round 18-21 picks on guys like Ray, Ziegler, Devine, or Street, potential closers that will more than likely put up good ratios but don't have a guaranteed ninth inning role. If you pick up two possible closers, chances are good that at least one will end up closing. I'd rather strengthen the other areas of my team than pick up a second ratio-killing RP in the name of chasing saves.