My opinions:
No. Pomeranz was pushing 100 pitches and his command was much worse in the 6th than it had been earlier.
Kelly - got to find out if he can be a bridge guy at some point. He made the one bad pitch that Upton hammered, but McCann actually hit ball 4 off his fists into a perfect spot. It was a pitcher's pitch and the batter got lucky.
Buchholz - Can't really complain here. He gave up a bloop hit to Iglesias, the passed ball was the difference maker in the inning; VMart hit the ball hard but it was on the ground and through a drawn in infield.
Given the overall implosion of the bullpen against over the weekend, I don't have an issue with the choices.
More a case of which bad match-up to take. If Farrell sends up Hill in that spot, the Tigers counter with a righty, probably KRod. Or, you have Holt vs. a struggling Tiger lefty who had allowed a run, 4 hits and thrown a lot of pitches in that inning.
While Holt hit over .300 against southpaws last year, he has struggled in very limited action against them this year. Hill lifetime against KRod is 2-11. Neither option was particularly appetizing.