The difference is that you can't influence if you have a long neck, long head, or whatever. But you can wear shoes like that:
I'm looking at SFs on DX that are listed taller w/o shoes than Gordon...
Harrison Barnes is 6'7 with a 6'11.25 wingspan
Smove 6'7 and 7'
Deng 6'7 and 7'0.5
Gay 6'7 7'3
LBJ 6'7.25 7'0.5
George 6'7.75(assumed to have grown further since) 6'11.25
Jeff Green 6'7.75 7'1.25
Durant 6'9(general opinion he's taller than that now) 7'4.75
So except Durant and George(assumed) there is no significant difference in height. Wingspans are higher compared to Gordi...
Now you add 6'5 GR3 with a 6'9 wingspan to the table. Yeah like that's gonna look good.
Other possible SF players measuring around 6'5:
Brandon Rush 6'5 6'11.25
Caron Butler 6'5.25 6'11.5