Admittedly, I only have the reports and rumours to go on. but they were that he had a big head and was demanding superstar money (without having earned it) as a fringe player. which was the reason that Bennett didn't even fight to keep him.
quotes from Bennett Re: Allen
“Corey has been very good, really good. He has surprised me,” Bennett said ahead of Allan’s backfield duel with Penrith rival Dylan Edwards.
“Corey had been recruited by the Broncos and he got a good offer to go to South Sydney (at the end of 2018).
“To be honest I didn’t think he would make it at the Broncos.
“He just wasn’t tracking in the right direction for me, but Souths saw something in him and thought he was worthwhile picking up.
“He went with my blessing, I just couldn‘t find a place for him in the Broncos team and I didn’t think he would play as he has subsequently played here at Souths.”
“Corey has played with confidence, I can’t give him a big enough wrap,” Bennett said.
“He probably needed to grow up.
“Corey has improved with his fitness and confidence in himself.
it was from Hooper, so ...