Rutherford is notably young for his level and was only at AA this year. He should at least get substantial time at AAA.
Collins may not be a young pup, but catchers do seem to take longer to develop because they're not just learning to hit, they're learning how to be the field generals managing the whole staff, every pitch, and all the defenders. That does take some time.
Given everything he has to learn, I'm ok with him not catching 5 days a week, but I also don't like the idea of him playing 1b a couple days a week...unless you're bringing in a starting catcher elsewhere. If you're either saying that Collins's bat is so good that we need him playing more often, or you're saying that Collins is never going to be a catcher and he's another failure by our scouts, then go ahead and play him at 1b. If you think he can be a catcher long term and you're willing to work at that, then you act like it. If Collins is playing 2-3 days a week and McCann 3-4, I'm ok with that. If McCann is playing 6 days a week and Collins 1 day a week...well I'm ok with that if Mccann is earning it.
IMO, he still looked better defensively than Castillo.