We could have Harrison saying that Rob has not been convicted of anything, so to be fair (and as an officer of the law) he can't kick Rob out of the team.
I can imagine him arguing that in a cricket club meeting, but I think he would have recognised that if he insisted on keeping Rob, he'd lose most of the rest of the team, and better to have 10 mediocre players than just one good one. In any case, I wouldn't have thought Rob would be medically fit until next season - he'did need to have his stomach out and be fully recovered. There's quite a lot of upward stretching when bowling and fielding, and possibly batting, sometimes with twisting, which is all going to put a lot of strain on a stomach wound that isn't fully healed. And it's not long since he stopped using his stick (I don't just mean as a sympathy prop,) so he must have lost some aerobic fitness. And that's without the risk of being hit by a ball - and cricket balls can hurt.
I'd be surprised if he were their best player at the moment, and if I were captain, I would want a medical note from the doctor to say he's fit to play, just for health and safety reasons, even if he were my favourite team mate of all time and most popular player ever.
Actually, I'd probably care more then, for his own welfare, not just potential insurance consequences for the club if he were injured while not recovered.
I think Rob is quite plausible - he's always been very nasty and personal when people haven't slotted neatly into his world view - it's just in the past, he was more subtle and tended only to really go for it in 1 to 1 situations with no witnesses. Now things are unravelling, he's being less careful, lashing out like a cornered animal.