I didn't watch the video because I have zero respect for either of those two, but of course KG is an all-time great. I can't believe it's even debatable. I've been a huge fan of his game long before he ended up in Boston.
He dominated the game in every way in his prime. He's a 7 footer who averaged over 5 assists a game for 6 straight seasons, and over 4 for 10 straight seasons. He regularly took the ball down the court for the Timberwolves and handled playmaking duties. Saying a player can play all 5 positions or guard all 5 positions is overused these days, but in his prime he truly was capable of that.
In my opinion he's the single most versatile and complete player ever. Yes, there are many players shorter than him who also had no holes in their game; but he's 7 feet tall and was still capable of doing everything at an elite level aside from 3 point shooting. His stats in his MVP season are just mind boggling. 24 ppg, 14 rpg, 5 apg, 2.2 bpg, 1.5 spg on 50% FG and 79% FT. Just ridiculous, it doesn't get any more complete than that. Stats can't possibly do his defense justice either.
It's a shame that the best years of his career were wasted in Minnesota on bad teams. The most help he had there was Latrell Sprewell and Sam Cassell well past their primes; that's pretty bad. Duncan is a hell of a player too and I don't want to take anything away from him, but look at the talent the Spurs have had every year since he's been there. I truly believe if KG had had that strong of a team every season he'd have a handful of rings too. He really is loyal to a fault.
Anyone who thinks he doesn't belong up there with the all-time greats just doesn't know what they're talking about. 15 time all-star, 9 all-nba selections, 12 all-defense selections, MVP, all-star game MVP, DPOTY, championship, his resume is as complete as any other PF's.