I'm aware of Oliveira getting a cut but Gamrot was the planned back up that had full prep time, instead someone decided he fight Volkanovski on short notice(i don't reallt care whos decision it was, thats not my point, he could have fought a ranked LW that had a full camp). Arman already fought Islam on short notice, doing so again would be dumb cause he actually has a good chance of beating him with a full camp.
Volkanovski gave him a close fight with a full camp, Arman gave him a close fight on less than 2 weeks notice 5 years ago when he was 22 years old in his UFC debut.