He was the most surprising name on Danny's interview list to me, so I think the Celtics are definitely considering him. That said, at #17, I think there will be better talent available. If we acquire an early 2nd, he could be one of the options. He's a 3&D guy who will give you a monster dunk on the fast break or alley-oop. As noted, however, he's smallish. A useful guy on the roster, but his ceiling and floor aren't too far away from each other.
Suppose your top 10 is the big 4, Smart, Randle, Gordon, Vonleh, McDermott, and Saric in some order. That means at 11-17, you've got guys like Gary Harris, Nik Stauskas, James Young, KJ McDaniels, TJ Warren, Tyler Ennis, and Jusuf Nurkic. At least one of them will be available, and probably more than one, since invariably people rise during the process (like Zach Levine and Elfrid Payton, both of whom I personally like). Anyway, I'd like all of those players much more than I'd like Markel Brown. Most of them are wings like Brown. And at least one of them will be available at 17.