Full disclosure: I dreamed Embiid sliding, or at least grabbing Gordon. When that didn't happen, made sense to me to take Vonleh at 6. Yes, we have two other power forwards, but you could make the case for Vonleh, given his length and size, being 4/5, playing the 5, especially vs smaller lineups. Also is somewhat of a rim protector.
Drafting Smart, I just don't see where we improved in our rotations much. Is he any better defensively than Bradley? No. Is he better offensively than Bradley or Rondo? No.
More importantly, I feel picking Smart at 6 forced us to pass on Harris. Ainge said as much after the draft, saying they did not want another undersized guard. Jeez, you mean because you just drafted one in Smart? Gary Harris is a much better two way player than James Young. I feel Young is really going to struggle defensively. He has a pretty outside shot, but that's about it on the offensive end. Really can't drive, goes left all the time, so easy to defend. Gary Harris could have stepped in to start on the first day, would have been a much better back court mate with Rondo than Smart, he can really shoot the ball.
I wonder if the front office would have taken Smart at 6 had they known that Harris would be available at 17?
Smart is a far better prospect than Vonleh. Vonleh totally lacks the skills needed to play C. He has long arms, huge hands, and he might be an above-average shooter for his size... that's it. He is not a plus athlete. He's young, so he has upside, but I never understood the hype.
As for Garry Harris, he notched an 8' standing reach. For a defensive specialist, that's a really serious limitation. He is like Avery Bradley except that he can only guard PG's, and he is incompetent at getting to the rim (<1 ppp on just 1.6 shots per game). He can carve out a career as a 3&D SG next to a big PG, but he totally lacks upside.