Aramaki having a dispute with Fujitora doesn't mean they fought and injured each other. Also, if I'm not mistaken, Aramaki in that picture has a bruise on his forehead too, which might've occurred from fighting the Revs. It also stands to question why especially Aramaki couldn't just waste Morley as easy as Kaido wastes top yonko commanders.
As your boy Akainu phrased it, no need to find excuses.