I've no idea if Usmanov plans to follow Moshiri but it has always seemed plausible to me given their close history, Usmanov's facilitation of Moshiri's move to us and other reasons.
If Usmanov is to come I believe the earliest this will happen is when Moshiri, through Blue Heaven Holdings Ltd, exercises his options to acquire BK's and others remaining shares.
It seems inconceivable to me that Usmanov would overlap with BK while he's still a powerful force at the club. Can you imagine Usmanov and BK sharing a train from London?
This scenario may also be dependent on resolution of the new stadium which seems at an early stage so it'll be some time before there's certainty regarding Usmanov. The statement released today is irrelevant either way.