It's not an assumption and you can't say its stupid because you don't agree with it, look at our injury record, are you telling me we have 15 injury prone players? Bony went 2 season's at Swansea rarely picking up injuries, comes to us and picks up nothing but hamstring injuries for 1 and a half years...... Look back at Mancini's era and he publicly came out and questioned/criticized the medical team as to why so many players were constantly getting injured.
Bony's not even been at the club 12 months mate, the first injury he picked up was at the ACON so that can't be down to our medical staff, he then picked up some sort of virus/bug in preseason so couldn't travel, again nothing to do with our medical staff. The injuries he's picked up since I'm not sure about, where did you hear they were hamstring injuries btw?
As for Mancini, in the 2012 season we had I think the best injury record in the league when Phil Batty was our head doctor, Mancini had him booted out and replaced with his own doc, we then had a raft of injuries in Mancini's final year so it's a bit rich for him to be complaining about the medical staff.