All of these.I think he left cuz he wanted to fight more in Japan, so probably wanted to travel less. Also probably getting paid more in Rizin.
They fed Gucci to DJ, too early. Gucci may choose to ride out the rest of his career in Japan, or return to beat DJ in a few years, as he'll be entering his prime as DJ will be slowing down.He looks good but a dominant loss to DJ just killed his hype for rematch for a while.
He went to RIZIN and is getting his $$$