It makes no sense only because of the flimsy reason he's given. If you remember, he gave a totally different reason the year before and we released Large, moved Sullivan to Souths and debuted him in Rd 1, yet now it's Benji's coaching. I'm sure if we sacked Benji and put in Bellamy, he would find another reason he wants to leave.
There is a monster deal on the table somewhere or, and I am totally speculating here, he doesn't fit the islander culture at the club and he can't really say that publicly. He is also an ex-Parra fanboy and his old school coach is an assistant at Parra. It may be a childhood dream and he may feel more comfortable there.
He's a bit of an awkward kid, so he may struggle to fit into the gold chain influencer brigade. He just ain't that cool.