Tremendous PER, WS/48, ORtg numbers but the Mavs are better with him off the floor although a lot of that has to do with whom he's playing with. RPM has him as a healthy 2+ offensive player. I'm pretty sure all those numbers would come back down the earth if he played heavier minutes and was asked to carry more of a load plus I'm not sure how much of a center he is even though his wingspan/standing reach are tremendous.
Rondo has been a net negative for three injury plagued seasons in a row. There's so much he can do but I can't see someone with a near 40% TS who shoots 33% from the line being a net positive. The Mavs' offensive efficiency would decrease and I'm not sure how much heir defensive efficiency would improve.