Re: Undisputed best pound for pound player?
Assuming the NBA version is based on height, the best "pound for pound" player in the league today would be Chris Paul, followed by Rajon Rondo.
Chris Paul has few weaknesses in his game aside from his height, he's an MVP caliber player most of his years in the league so far.
All time, I would say Tiny Archibald. Though I haven't seen much of him (except past his prime on the 1981 Celtics, though he was still very impressive), he averaged more than 30 points and 10 assists one season, was a 3 time All-NBA first teamer and twice was in the top 5 for MVP voting.
Other contenders would include Isiah Thomas, Allen Iverson, John Stockton and Bob Cousy.