This is a pretty good landing spot for Brown, who has familiarity with Tom Brady from their day(s) in New England. In Brown's one game for the Patriots, Brady peppered him with eight targets on 35% of the snaps. As long as he's healthy, he'll be startable in fantasy.
His arrival will certainly impact Mike Evans and Chris Godwin, though through six games, 17.3 targets per game have gone to players other than Evans, Godwin, Rob Gronkowski and Ronald Jones. Some of that has to do with Godwin's injury, which cost him three games, but if the targets get concentrated to those five players--Godwin, Evans, Brown, Gronk and Jones--there is enough work to go around, provided that Brown doesn't come in and get 10+ targets per game.
Given Evans' drop in targets when Godwin is healthy (from 25.0% to 10.8%), I'd say that Godwin is a safer bet to hold his usage than Evans is. As we've learned, Brown's behavior is a major question mark, and there's no guarantee that he'll be on the roster in a month. - John Paulsen