Canning Bogar and Candaele seems to be a bit of a panic-type move. You know, the "I have to do something" variety.
I am not impressed by the move, really.
Fangraphs has Gamel as a +1.2 UZR in RF but a -2.8 in LF. I find that a bit suspect. He got to 11.1% of the 1-10% balls (Remote), 40% of the 10-40% balls (Unlikely), 80% of the 40-60% balls (Even), 80% of the 60-90% balls (Likely) and 97.4% of the 90-100% balls (Routine). Where's the beef? He had 4 errors in LF, and I remember him dropping at least 2 balls. But I still don't see the data that suggests he doesn't hold his own out there.
Heredia's is better.....but you lose with the bat, as well. The natural use of the two of them is in platoon. Then you get Gamel's .746 vR and Heredia's .794 vL.