[Mick]

Plenty of 6'3" guards and shorter (who are mostly scorers) have careers in the NBA. What a strange argument.

You know about Earl Boykins, Spud Webb, Muggsy Bogues and Nate Robinson, all 5'9" or shorter.  How about:
Allen Iverson.  6' even.
Calvin Murphy.  5'11"
Brevin Knight, 5'10"
Isaiah Thomas, 5'9"
Isiah Thomas, 6'1"
Damon Stoudamire, 5'10"
Michael Adams, 5'10"
Stephon Marbury, 6'2"
Avery Johnson, 5'10"
Steve Nash, 6'3"
Mark Price, 6' even
Rajan Rondo, 6'1"
Tony Parker, 6'2"
Kevin Johnson, 6'1"
Tim Hardaway, 6' even
KC Jones, 6'1"
Mo Cheeks, 6'1"
Gail Goodrich, 6'1"
Bill Sharman, 6'1"
Hal Greer, 6'2"
Chris Paul, 6' even
Bob Cousy, 6'1"
John Stockton, 6'1"
Jerry West, 6'2"

[Mick]

Plenty of 6'3" guards and shorter (who are mostly scorers) have careers in the NBA. What a strange argument.

You know about Earl Boykins, Spud Webb, Muggsy Bogues and Nate Robinson, all 5'9" or shorter.  How about:
Allen Iverson.  6' even.
Calvin Murphy.  5'11"
Brevin Knight, 5'10"
Isaiah Thomas, 5'9"
Isiah Thomas, 6'1"
Damon Stoudamire, 5'10"
Michael Adams, 5'10"
Stephon Marbury, 6'2"
Avery Johnson, 5'10"
Steve Nash, 6'3"
Mark Price, 6' even
Rajan Rondo, 6'1"
Tony Parker, 6'2"
Kevin Johnson, 6'1"
Tim Hardaway, 6' even
KC Jones, 6'1"
Mo Cheeks, 6'1"
Gail Goodrich, 6'1"
Bill Sharman, 6'1"
Hal Greer, 6'2"
Chris Paul, 6' even
Bob Cousy, 6'1"
John Stockton, 6'1"
Jerry West, 6'2"