If I absolutely had to pick at 3 because I couldn't find a trade partner, it would be Pitts's name on the card. AS good as Smith is, I feel there are a lot of options lower in the order that maybe don't fit as well but the drop off is not as steep. Sewell is the only other I would consider, but with the investment we've already made in the line, if we do add more pieces to it I would rather wait till round 2. I'm not picking a D player when it's our O that needs help. Pitts would offer us so much and help Tua in ways we can't imagine right now but he's not a silver bullet either, we also need to target an Eskridge later on and a Williams too. If we could get these offensive players in this draft, this O could be extremely potent and if this is our first 4 picks (in any order) I would be bouncing off the walls:
Pitts (TE/WR)
Williams (RB)
Humphrey (C)
Eskridge (WR)
I would add another WR too, to this late on, plenty to choose from like; R Moore, E Moore, St. Brown, Marshall, Wallace, Rodgers, Surratt, Imatorbhebhe, Smith, Fitzpatrick, Grimes and many more. Maybe consider a second RB too like Paterson, Sermon, Carter or Stevenson.
But knowing us we'll probably throw more picks at a D that doesn't need as much help as the O