Zach's my favorite player on the Grizzlies but I agree with @holidayinn21 here. While I didn't want to see him go to the bench and was skeptical at the start of the season the move has turned out to be a great one for our offense.
Z-Bo plays really well off of the second unit and keeps the offense flowing instead of dying out like in the past. In previous years when our bench came in the offense stalled, and the starters had a hard time getting back in rhythm once they returned which led to our scoring droughts.
JaMychal's probably our best defensive big and can play well off of either Gasol or Randolph, let him try and keep opposing bigs from going off at the start while Zach can finish games depending on the opposing teams personnel
When was the last game that he even blocked a shot? Gasol and when healthy Wright and Davis are way better defenders just keeping it a hunid. It's just a thing people say but I've never noticed him being a impact player on that end of the floor consistently.
Green is a good player that hustles and plays his role great but he shouldn't be starting.