In my opinion, McInnes' biggest faults have been this:-
1) An inability to know his preferred structure, or his strongest 11 therein, till about the midway point of the season (this season he is knowhere near knowing either)
2) Once he has cracked the above, he doesn't know how to rotate "squad" players in and out of that system, to give some players a much needed break, resulting in the aforementioned players suffering fatique at
important points of the season.