Great analysis, Dumpy. I think the point about offensive rebounds is especially well taken because it's been really obvious to me as a viewer without paying attention to numbers or counting in the least. My impression is that a lot of it correlates to increased minutes and starting role for Brook. He not only gets a lot of second chance possessions himself but keeps balls alive and generally consumes space in such a way that teammates are getting some offensive rebounds they might not otherwise.
Even though the numbers are not necessarily showing it, I do think their team defense has improved in the last few games. It's now often taking 3-4 passes to get a good shot instead of 2-3.