Are you serious? Twins fight all the time, my mom wants to shoot her twin sister. Did you forget Roman telling Jey that Jimmy was jealous of him becoming the right hand man? They literally planted the seeds for this months ago.
It doesn't make sense.
When Jey was the Right Hand Man, Jimmy returned from injury and he was trying to be with Jey again but Roman was getting in the way. Roman started getting disrespectful with Jimmy and Jimmy literally told Roman that "you're not going to talk to me the way you talk to my brother" in one segment. Jimmy then started wearing a shirt that said he's nobody's bytch. Jimmy's entire issue was that he HATED JEY BEING THE RIGHT HAND MAN AND HATED THE WAY ROMAN TREATED JEY BECAUSE JEY DESERVED BETTER.
Fast forward to the last few months, Roman starts disrespecting Jimmy. Then he disrespects Jey and Jimmy attacks Roman to defend Jey. Jey eventually joins Jimmy.
The idea that Jimmy turned on Jey because "he wants to be the tribal chief" or he's jealous of Jey's success is stupid when Jey's entire fight with Roman since Jimmy got hurt is because JEY WAS DEFENDING JIMMY'S HONOR AND WAS PISSED AT WHAT ROMAN DID.
Again, this is fukking stupid.