They put up great offensive numbers as well. Also, both of them got great amounts of rebounds and blocks. The funny thing is, the two were more similar than different. KG was a natural SF playing PF, Robinson was a natural PF playing C. Both had horrible teammates, neither had a real go-to offensive move, both were made to be the defensive anchor of a championship team, but can be an extremely effective scorer, both were ahead of their time in the sense that they were these uber-athletic bigs, neither had great wing support throughout their entire careers, both won championships as the pseudo-lead after their peaks.
They put up great numbers across the board.
WS, ORtg, DRtg, and VORP are not really stat padding friendly. They all have their flaws, but I find WARP to be one of the weakest.
It's not just pace, and I think most advanced stats already took pace into account. The biggest issue is that the game has evolved in that the roles of players have changed. Advanced stats are "made" today so it is constructed with assumptions using today's game, which is very unfair to the old timers.