[quote="SF88"]
And no player has ever gone to the D-league and come back as a star player
[//quote]
http://en.wikipedia.org/wiki/Correlatio ... _causationSending a player to a D-League doesn't magically limit their prospective values as role players. If Lance Stephenson was sent to Indian's affiliate in his rookie season, is there any legitimate reason to believe he wouldn't be as good as he is now? If Archie doesn't pan out to be more than a role player, (and assuming he puts in the proper work effort) its simply because that's just how good he turned out to be. Likewise, if he becomes an all-star, we won't look back and say "oh wow those games in the D-League really helped him reach the plateau he's at today". Point being, experience in the D-League is usually trivial for a player's future, and it's silly to think that being sent there will be such a detriment.
Secondly, the sample size is too small to draw such a conclusion. The D-League has been around since 2001. The league didn't expand to 12 teams until 2006 and it was only around this time (iirc) that teams started using it to develop players already on rookie deals. It's still largely just largely just a place for fringe NBA players, and not a true minor league system. In baseball, if a player's going through a bad stretch, recovering from an injury, or are just too raw for the premier level they are sent to a minor league. I expect more future lottery picks with good potential, who's minutes are buried by rotational players, to see more time in the d-league within the next decade.
Jeremy Lamb's looking pretty good right now...putting up about the same numbers Lance Stephenson was in his 'breakout year' (and James Harden in his rookie year).