I think Collins is going to be a valuable addition to the lineup, but there will be a subsection of Soxtalk that absolutely loathes his batting profile. The strikeouts, the passivity, and low batting average will drive a few people nuts.
I saw that yesterday and was confused. I thought it was something bugging/erroring out. I checked transactions and I don't see him reinstated from the IL.
His pitch mix really hasn't changed his last few starts from what I've noticed. He just hasn't been able to find the strike zone with his fastball. I think Dan's assessment is correct.