This is more owned at league admins, maybe an option for them only?
As it stands now if you want to contact someone who was in your league but not long enough to register on the teams history, you cannot find them unless you trawl some 70 leagues . They leave no footprint. Or maybe simply add an owner to a teams history regardless of how long they own for?
Enter and exit dates (specifically, Midweek #10 of Year 2020 Smirt211 vacated the team to AI) to assist with game planning/figuring out when AI has taken over a team from a previous owner. Line of division.