Sounds like a recipe for losses ...
why?! He is athletic enough to keep up with shooting guards and big enough to take advantage of size over most of them.
Because you have Gerald Wallace at SF alongside Jeff Green instead of Pierce and G-Wallace has nowhere near the offensive skill-level of Pierce. His inability to create proper floor spacing dooms that lineup.
You have two bigs on the floor who have jump-shots (Sully, Bass, Olynyk. A limited jump-shooting SF in Wallace. J.Green at SG. Then either Rondo, Bradley or Pressey at PG who all have limited jump-shots relative to their position too. That means defenses can collapse all over J.Green when he gets deep catches. And J.Green he gets touches far away from the basket, he is attacking a defender who is quicker than he is and better able to stay in front of him. And if it is Rondo, you have to take the ball out of his hands to run post-ups for J.Green and G.Wallace inside which lowers the value of Rondo's playmaking.
All it is going to do is kill ball + player movement (by forcing post ups and creating stagnant movements) and result in the team taking a much larger number of long range two point jump shots ... the least efficient shot in basketball.
This Boston team doesn't have the personnel to make J.Green at SG an effective option.
They are too short on offensive firepower.