At #6, give me Chase, Pitts or Sewell. Smith is a good enough player to get picked there but I lean toward size at that point in the draft.
There is a lot of Dolphins buzz around Smith, though, and he is a personality fit.
FWIW - Ja'Marr Chase only measured at 6'0" at the pro day. 41" vertical and 11" broad. That obviously shows up on tape. Should be getting other results within the hour, but he looks like he's killing the pro day.
How many round one corners, current and future starters in the NFL has this man made his adopted son on the field? When you've beaten all-conference, round one corners like he has, and not just for a highlight or two, but beating them like drums all game long in numerous scenarios (not just running free on a vertical...but contested catches, creating separation after the ball is in the air, handplay, etc)...I can not doubt him doing the same in the NFL. If he were 6'3" he'd be on Calvin Johnson, Andre Johnson, Larry Fitzgerald, Julio Jones tier of WR prospect.
Smith is so good at the craft of being a wide receiver and has been so good for so long among 3 other Round 1 WRs...I can't doubt him either.