Probably a number of factors here. Curtis is a big supporter of growing homegrown players and developing them into legit first teamers, which we know is not Vanney’s strength.
He has been here and done that. Perhaps wants a new challenge.
Galaxy job is open and he can move his family back to the US. Know he loves Canada but he is American and being successful at the Galaxy will put him in a position to take over the USMNT if/when Berhalter messes up.
My guess is all three played a part but as they were in what was reported to be good contact talks along, I think he was not ge