Seconded! Hell, Thirded!
Markie has arrived. Just like JJ, whose game became rounded his senior season, the same thing has happened to Markie.
Well, 'happened' doesn't say it. He grew into it through sheer effort and desire. I 'spect it could have occurred sooner, but (fingers crossed, here) the injury bug kept biting him.
Being healthy cures a lot of things and allows for growth. Your observation about his keeping his head up is spot on.
(I do hope, when he cuts to the basket from the top of the key, he is using new sneakers for each game (a la Jeff Mullins, who went through a pair per game), so it minimizes his slipping on those damn decals and shiny paint jobs. Wet spots are one thing, but those painted areas/decals can be just as much trouble and you can't wipe them up.)