Brown's deficiencies are certainly his effort level or work ethic game in & game out & his inability to use his size more to be more physical. I doubt he will ever be a physical player it just doesn't seem to be in him but he can improve his work ethic with every shift but he seems to need to be pushed.
On the other hand, his skill set is his vision, his hockey IQ & his passing abilities which are close to being elite. He's not a great skater but he's not slow either, he does need players to get him the puck so he can make great plays but needs to work on his effort level & intensity. He's got a good shot but doesn't use it as much as he could, he's got a pass first mentality. He's not emotionally charged like Stone but more of a quiet cerebral type, he can see plays developing & get the puck to an open player through traffic. With his combination of size & skill set I think he will be in the NHL but depending on who he plays with could have a significant impact in the top 6, but regardless of where he plays I think he improves the team as a whole.