Here is a bit of info:
C: Wellington Castro
VS: RH pitching: .289/.326/.383
VS: LH pitching: .203/.299/.237
So he hits RHP better. Makes having a LH back up pointless.
(this is not getting into him being a quality starting catcher or not.)
Dioner Navarro:
LHP: 18 AB: .556/.652/1.056
RHP: 63 AB: .175/.235/.333
Now I would plug in Navarro when there are LH's but this is on Dale. He likes starting a less productive player based on potential. Again this makes the theory of Dale just being the fall guy for the rebuild project hold more weight.
Other positions:
3B: Valbuena: .247/.365/.418 6 HR Good glove. I would say he would be a down grade and that is sad.
1B: Rizzo:
VS LH: .229/.308/.427
VS RH: .248/.337/.455
Again if anything they could use a RH back up. plugging Navarro over there to get some AB's would make more sense.
Again Steve Clevenger is not needed and to be honest is a waste of a 40 man space.
His true purpose on it is for injury depth.