2001 1st round vs. Spurs: Duncan 22.5ppg on 46.6%
2002 1st round vs. Mavs: Dirk 33.3ppg on 52.6%
2003 1st round vs. Lakers: Shaq 28.7ppg on 51.6%
2004 WCF vs. Lakers: Shaq 20.7ppg on 56.9%.
This is where we enter dangerous territory with how they performed against KG straight up, considering that not only are there a handful of games within a series but also let's not act like Dirk, Duncan and Shaq were getting all their points at that efficiency when being guarded by KG (same must apply to the stats I provided as well).
Especially in this game where Dirk only scored a one to two buckets against KG, and Dirk would effortlessly score on switches or swing ball situations when KG was elsewhere on the court -
That was the height of his defensive prime. When he really was probably the best defensive player on the planet. His man still cooked. Usually very efficiently. If Kobe wasn't ballhogging in 2004, Shaq could have dropped 30ppg on 55% easily.
Great offensive players will cook regardless no matter who they play against, they'll always find a way to get their points (switches, fast breaks, elite defenders off court, defensive breakdowns, second chance points in the paint). KG typically didn't guard Shaq - Flip/Casey would use a bigger body and allow KG to patrol the perimeter/paint - as this was the best possible formula given their personnel.
To be fair, I'm not sure KG was guarding Shaq. They probably kept him off to keep him out of foul trouble, but if he's such a great defender, you'd want him on Shaq to try and neutralize him, no? I mean, LeBron took KD in the 2012 Finals. Kawhi takes LeBron and Durant. No hiding there..
It's not as simple that, considering they both played different positions and it wasn't like the slow, lumbering figures of Nesterovic and E.Johnson could guard PNRs and rotate around the perimeter like KG could - the T'Wolves defense would've been worse if KG stayed primarily on Shaq and had the center guarding and helping outside of the paint.
Least of all let's not act as if Kawhi doesn't play in a great defensive system and elite rim protection to help him out. Kawhi really only had the defensive workload of one player whereas more often than not KG had the workload of two. Their situations aren't comparable at all.
And you are right, there are more aspects than simply what your man does against you. I've never denied KG's defensive prowess. I'm just saying that the hype was a bit overblown in playoff series when his man was still able to get his (fairly easily) AND the opposing team didn't really struggle at all to score.
That's mostly because he was surrounded by shytty defensive players. *cough Szczerbiak cough*, and had to cover up for their miscues which had a mechanical effect on the rest of the defense.