Well, you're asking your #2 ruckman to do a fairly hard job with the way the game runs these days. He's got to drop back or forward to provide an option, play on the ball and offer another big body through the middle plus a 3rd man up, then when the #1 takes a rest or is swinging through forward or back he's got to go hard and compete at every bounce or restart.
For that very reason, you can't expect Griff and Sandi to play in the same side unless something weird is going on. Both are #1 ruck types whereas Zachary Clark provides a good template for the #2 type. He's mobile and agile along with being a dedicated follower of fashion, and you can't have too much of that in football, after all.
