Team defense should not be that difficult to figure out. It's something like (plus plays - (minus plays + errors)) + ((CS% - .250) * SBA). This makes the assumption that a .250 CS% is average. The problem with the formula, though, is that sometimes a play is scored as both a minus play and an error. Or my personal favorite, the +- play.
I will disagree that babypop that DPs mean anything in HBD. I have been unable to find a correlation between any defensive rating and DPs. DPs fluctuate wildly between seasons (much like BABIP for pitchers), even with the same infield and same pitching staff.
Pitchers with high durability are awesome imo (I just realized this recently, after signing elcano) - they recover quicker and can get back on the mound more frequently. Thats why starters generally have 20s-30s Dur so they don't start back to back games at 100 fatigue. Hawkins 15 stam is garbage but his 80 something dur gets him out there 3-4 games in a row in some cases at 100%. something to consider... or not.