He was clinching up with Jones but mostly seemed to be using it as a setup to landing dirty boxing to me rather than pushing that heavily for takedowns, it was only latter in the fight that his focus seemed to shift.
Was certainly a supprize for me watching the fight, I suspect Jones has focused much of the last few months on improving this area of his game knowing he wouldn't be able to depend on using takedowns(or the fear of them) and the clinch to avoid exchanging aggressively with DC.
That said I do think Jones still had some fundamental weaknesses in boxing technique and to me it looked like Cormier was getting past his box of tricks in the second(the best round I think anyone has had vs Jones) to exploit them, just couldn't maintain that kind of pace to carry on doing so.