Consider this: Derrick Rose’s usage rate this season is 26.2 and his assist rate is 23.1. In contrast, Ricky Rubio’s usage rate this season is 14.9 and his assist rate is 36.2.
With Anthony and Porzingis, the Knicks don’t need a high-volume shooter at the point guard position. They need a point guard who can run an offense and, just as importantly, keep opposing point guards from penetrating into the heart of the defense at will.
Rubio is an underrated, aggressive defender. He doesn’t have the quickest feet, but he has active hands, a nuanced understanding of defensive positioning and a willingness to fight through screens.
Defensive Real Plus-Minus (DRPM) is a defensive metric which tracks a player’s estimated on-court impact on team defensive performance, measured in points allowed per 100 offensive possessions and accounts for team and opponent context. This season, Rubio has posted a DRPM of 0.58, which is the eighth-highest mark among point guards. In 2015-16, Rubio was at 1.89, which was the second highest DRPM among qualifying point guards in the league, behind only Chris Paul. In 2014-15, Rubio led NBA point guards in this category.
Derrick Rose, on the other hand, ranks 85th out of 89 qualifying points guards in DRPM this season. In 2015-16, he was also in the bottom 5 percent among qualifying PG’s.