NBA players 22 or younger with Usage% > 25%, with offensive efficiency (points produced/100 possessions used) and relevant season in parentheses. If players did it multiple times before age 22, the best offensive efficiency year is listed:
Chris Paul (125 in 2008 @ age 22)
Amar'e Stoudemire (121 in 2005 @ age 22)
Shaquille O'Neal (120 in 1994 @ age 21)
Chris Bosh (118 in 2006 @ age 21)
Kevin Durant (118 in 2010 @ age 21)
Michael Jordan (118 in 1985 @ age 21)
LeBron James (115 in 2006 @ age 21)
Terry Cummings (113 in 1983 @ age 21)
Derrick Rose (113 in 2011 @ age 22)
Kobe Bryant (112 in 2001 @ age 22)
Eric Gordon (112 in 2011 @ age 22)
Blake Griffin (111 in 2011 @ age 22)
That's it. That's the entire list in the three point era of guys at Gordon's efficiency and usage, by his age. Blake Griffin's phenomenal rookie year is tossed in for fun. Chris Paul is atop the list - his 2007-2008 is arguably the greatest season by a 22 year old ever.
Is this a cherrypicked stat? To an extent, yeah. But Gordon's 2010-2011 puts him in some very good company, any way you slice it. Every single one of those guys was, is, or will be a multiple-time All-Star; if Gordon can keep up the pace over a "full" season this year, he could well join them.
So that's our new shooting guard. This is also him: