I need to rewatch the bout, but was most of that damage even from legal blows? The very first time I noticed an abrasion on Usyk (under his right eye, if I recall correctly) was when they emerged from some skirmish or clinch that didn't seem to involve a punch from Joshua, although I should note that the camera angle on the feed I was viewing left the viewer somewhat unsighted in that sequence.
I recall glimpses of sneaky headbutts by AJ. Very well disguised too. I remember there was definitely one in the 7th or 8th. I'm going to rewatch the whole fight and if it shows up again I'll timestamp it for you.
That's what I thought I saw in the heat of live viewing. I just didn't want to state it as fact without rewatching first. Thankye, friend.