The most interesting aspect of the club's reported "leadership trajectory" at present, which I've seen mentioned in more than one outlet and context, is the increasing involvement and decisiveness of Tim Lewis.
Lewis was already the trusted Kroenke henchman whose arrival on the Board signalled a cleaning of house and the end of Sanllehi.
If there were any "push factors" involved in Edu's exit, my bet would be on Lewis's presence and reported increased involvement in decisions, and his positions and style having a lot to do with Arteta's apparent clout with KSE.