Went up in my book, because Volk showed he is extremely versatile. He can fight as a point fighter, he can be the aggressor. He can adapt on the fly and make the adjustments needed (shown perfectly in the second Max fight). And he surely has the heart of the champion.
I don't rate Ortega super high and after all Max absolutely murdered him, while Volk was in trouble several times. Yet again styles make fights, so I won't hold the way Holloway took care of Ortega against Volk.
P.S. Also the way Herb and the doc let Ortega recover was super suspect, ask him how many fingers he sees while he is on the stool, not after the minute rest between rounds has passed.