Boutte was thought to be a 1st Round pick after his Freshman year. Injuries and problems (with Chip Kelly) plummeted his stock. But he didn't suddenly lose those 1st-round traits.
Go look at the "draft profile" between Boutte and Stephon Diggs, the athleticism, in particular. Diggs couldn't make it as an outside receiver, dontchaknow?
The kid has come in and seems to be on the right track. He's making plays, he's causing no trouble (quite the opposite - seems he's determined to erase the reputation that came after his injury). He's admitted that he was checked out, and for a kid to have that awareness and ADMIT his personal failure is pretty impressive.
It's one play in a preseason game, but that slant the other night was exactly the type of play that's been missing in the last couple of years...where Harry or Meyers or some other lumbering guy wouldn't have had enough separation to take it much further. Boutte caught it cleanly and fully, had it secured and was up to full speed the whole way and easily outpaced the pursuit. he wasn't looking to just catch the ball, but to snag it and GO.
I'm sorry, but they'd be nuts to cut him. There are qualities you need to see in a player in any sport that you can't quantify with a number.