If you think that he's playing poorly now then say he's playing poorly now. Making a post saying "An injured player had bad numbers last year" does nothing for your point. Unless all you want to do is criticize him whether it has merit or not. I realize Callahan is the new Carle around here but if that's true then you should have plenty of actually relevant things to use against him instead of the period of time when he should have just had the surgery he needed instead of playing. This isn't Callahan-specific. I think it's pointless to judge players' injured play by the same standards as when they're healthy.
I think we gave him the benefit of the doubt in the off-season. The problem is he doesn't look much different now. I feel like it's been a long time since Callahan was objectively better than JT Brown.