If you are asking me, it is simple: Combo forward, Arizona, very athletic, similar size
For anyone who does not agree, let's remember Derrick Williams was the 2nd overall pick in the 2011 draft. There is a pattern of combo forwards not working in the NBA. Frankly, they scare me to death. Here are some I can think of:
Chris Singleton
Derrick Williams
Jan Vesely
Marcus Morris
Markieff Morris
Michael Beasley
To your examples:
Vesely is not nor has he ever been skilled at all on either side of the floor. He was drafted entirely on physical attributes. Unsurprisingly, he hasn't worked out.
The Morris twins, I think, have worked out pretty well considering the expectations of them when they were drafted. Both look like borderline starters with useful abilities.
Beasley and Williams are probably the basis of your strongest argument; both were highly talented college players taken near the top of the draft with high expectations.
The key difference there, I think, is that Beasley and Williams were offensively-oriented players without a position on defense. Gordon is the converse.
In my view, combo forwards who can guard multiple positions but who have a less refined offensive game are much more likely to find a place in the league. Combo forwards with no defensive position at the NBA level are much harder to keep on the floor.
Gordon could come in and play significant minutes right away because he can play defense. As long as he develops a reliable corner three jumpshot, he could get by offensively.
I agree with others who have said that Gordon is probably a role player in the NBA, although he has the potential to be an extremely valuable one. Using our top pick, for which we have endured a season full of losses, on a player whose ceiling is "superior role player," would on some level be disappointing.
At the same time, Gordon is the type of player that winning teams need, and I'd rather have a versatile defender and high level rebounder at the SF position than a complementary scorer like Jeff Green.