That's generally how he looks vs aggressive grappling - he always been prone to being pressured against the cage where he tends to give his back to get up which leads to him fighting back takes and rear naked setups. See khabib fight (also where he repeatedly chases the guillotine), oliveira fight, chandler fight to a lesser extent, and even the Dan hooker fight(plus kept chasing the guillotine iirc).
This was what I and anyone who looked at the matchup expected - Dustin defends against the cage and eventually exploits bsd being so hittable on the feet, or bsd is able to wear him down against the cage and hunt for the rnc