At that level, the difference comes down to just how hard you want it.
I am liking Brown's skill set and athleticism, but it is really going to come down to the above. Much like Smart, Crowder, AB, IT, and even Amir, Jaylen seems to have an intrinsic motivation that could really lead him somewhere. Unlike those guys, there are no real limitations to his size or athleticism.
The Cs clearly have an identity and Brown fits right in. Unfortunately, he is likely not to get as much time as other top rookies (due to being on an excellent team), and therefore will be labeled a bust pretty early on. That will be annoying.