No doubt there are solid guys in the D-League...but you're hyping it up like it has supreme competition. The guys are there because they couldn't cut it on the league, or even MAKE a roster.
Lance Thomas once tore up the D-League. CJ Williams from NCSU is a Top 20 scorer there now. Who is CJ Williams? Exactly.
There's a handful of guys in the NBDL who will ever sniff a NBA roster again...college may or may not have better top to bottom talent overall (although I think it does)...but the college game without question has better top end talent than the NBDL and the castoffs it employs much of the time. The top prospect in the NBDL is Pierre Jackson (according to their website). THE Pierre Jackson. Instead of squaring off against Jabari, Hood, CJ Fair, Tyler Ennis and other 1st round guys in the ACC alone...he's not getting to learn from Roy Williams or go up against guys like K and Boeheim who game plan for him. It's great he's doing well in the D-League...but a lot of even sub-par guys (not saying that's PJ) as I've pointed out have dominated the D-League before.
Every guy in the NBADL is playing at the next level (though it's not the next level that most envisioned they'd be in...
Over half of the players in the ACC won't even sniff an NBA roster let alone get a chance at being drafted.
Not to mention that Hairston is going against full grown men, not freshmen and sophomores in college.
I noticed that you only mentioned Pierre Jackson... but you also failed to mention players like Devin Ebanks, Darius Johnson-Odom, DeAndre Liggins, Hilton Armstrong, Terrence Williams, Shawne Williams, Reggie Williams, Daniel Orton, Seth Curry, Fab Melo, Ike Diogu, Troy Daniels, James Southerland, DeQuan Jones, Dee Bost, Justin Hamilton, Dominic McGuire, Joe Alexander, Willie Reed, Josh Howard, Richard Howell, Rodney Williams, Sherwood Brown, Lorenzo Brown, Justin Brownlee, Isaiah Cannan, Jackie Carmichael, Derrick Caracter, JamesOn Curry, Dewayne Dedmon, Larry Drew, Nando De Colo, Melvin Ely, Mickell Gladness, Abdul Gaddy, Terrel Harris, Dennis Horner, Ron Howard, Scoop Jardine, Kevin Jones, Myck Gabongo, Ryan Kelly, Kenny Kadji, C.J. Leslie, Ricky Ledo, Trey McKinney Jones, Tony Mitchell, Ronald Murray, Hamady Ndiaye, Alex Oriakhi, Dexter Pittman, Kareem Rush, Dexter Strickland, Mustafa Shakur, E.J. Singler, Sean Singletary, Tyshawn Taylor, Adonis Thomas, and Luke Zeller... All guys who were very good college players (even great college players)... I'd rather Hairston get to play against that competition over a lot of the players in the ACC that aren't on Syracuse or Duke.