Whiteside's per minute rebounding and block numbers have always been insane at the NBA and D-League level. His total numbers in the D-League were like Wilt Chamberlain or something. Rebounding/blocks are two of the best per minute stats for staying consistent as minutes increases.
As Tyson Chandler, DeAndre Jordan, Andre Drummond, etc. have shown, you grab enough offensive boards and do pick and rolls and you can get double figures scoring pretty easily.