If Obekpa is 6'7", then Kobe is 6'3". It's all relative.
It is typically what you measure in shoes with a round up to the nearest inch, but most players exaggerate their heights--and for good reason ($$$). That is what makes official measurements so important at the combine. Chris was only measured at 6'8.5 WITH shoes at the 2013 big man skills acadmey, although he did measure an excellent 7'4.5 wing span (his greatest asset for NBA).
At 6'8.5 WITH shoes, it will be really hard for him to stay with NBA centers given his below average strength and average to slightly above average athletic ability. For example, the #27 overall pick in 2013, Rudy Gorbert, measured in at 7'2 WITH shoes and a 7'8.5 wing span. Surrendering 5.5 inches to a guy like that is too much to overcome for a player like CO.
I've been posting for a few years about the size i and international talent shaping up to be in this year's draft...terrible year for him to come out. Here are some of the guys coming out and their measured heights/wingspans:
Projected Top 20 picks:
Jahlil Okafor 6'9.5 without shoes (7'6 wingspan)
Carl Towns 6'10.25 without shoes (7'3 wingspan)
Kristaps Porzingis 6'11 without shoes (7'4 wingspan)
Willie Cauley-Stein 6'11.25 without shoes (7'2.5 wingspan)
Robert Upshaw 7'0 WITH shoes (7'4 wingspan)
Kevon Loony 6'9.5 WITH shoes (7'3 wingspan)
Montrezl Harrell 6'6.5 WITH shoes (7'3 wingspan)
Christian Wood 6'10 WITH shoes (7'2 wingspan)
Cliff Alexander 6'9 WITH shoes (7'3.5 wingspan)
Myles Turner 6'10 without shoes (7'4 wingspan)
Frank Kaminsky not officially measured but looks to be 6'10 without shoes and 7'1wingspan
The next tier of bigs
Dakari Johnson 7'0.25 WITH shoes (7'0.25 wingspan)
Kennedy Meeks 6'9.5 297 pounds WITH shoes (7'0 wingspan)
Guillermo Hernangomez 6'11 WITH shoes (7'1.5 wingspan)
Chris Obepka 6'8.5 WITH shoes (7'4.5 wingspan)
Mo Jaiteh - 6'11 WITH shoes (7'4 wingspan)
AJ Hammons - 7'0 WITH shoes (7'3 wingspan)
Sean Long 6'10 WITH shoes (7'0 wingspan)
SFs and Combo Forwards:
Rondae Hollis-Jefferson 6'7 WITH shoes (71" wingspan)
Bobby Portis 6'10.5 WITH shoes (7'1.5 wingspan)
Chris McCullough 6'9 WITH shoes (7'3 wingspan)
Justin Anderson 6'6 WITH shoes (6'11 wingspan)
Chris Walker 6'9 WITH shoes (7'1.5 wingspan)
Jake Layman 6'9 listed SF no official height or wingspan
Brice Johnson 6'9.5 WITH shoes (6'11 wingspan)
Jarell Martin 6'7.5 WITH shoes (6'10 wingspan)
Sam Dekker 6'9 WITH shoes (6'10 wingspan)