I agree on Rivera, he should have the shot at a full time job, and I think he is going to get it here over the next 6 weeks or so.
Aybar has more experience than Kendrick. Perhaps the thinking is he'll have more success immediately at the plate.
Kenndrick has really moved up fast. Did not have a whole year at AA last year, 1 month a AAA before the call up, a lot to ask of a player. I think they probably did the right thing sending him down. He got a taste, knows what he needs to work on now.