I think it’s likely that the original plan was for the flashback to reveal that Kev didn’t just stab himself but that he was behind Jez targeting Robert to begin with. So that he could “rescue him” and make Robert more dependent on him.
It’s never made sense to me if Kev was this feared psycho why he would let the beatings get so bad before intervening, or why Robert would have been targeted at all given who his cell mate was. Kev’s presence should have been enough of a deterrent from any bullies.
It will in fact remain my head canon until I’m told otherwise. Of course the chances of the show ever actually revealing it now that Kev is the cuddly cake man are slim.
