Ultimately any move is going to be Jacks decision. Does he want to get to the promise land that is champions league glory or is he willing to sacrifice it to aid his club to the promise land?
Non are guaranteed, he goes to Man City and could well end up being a bit part player. Or stay at Villa and the project taking longer than his remaining career, or worse it completely failing.
Even Man City are in large is a project not fully realised. With all that time, all that money, all them club legends and all them great players, yet they still haven’t won the CL.