How about the following:
TA
Arthur
for
Robinson
Harangody
It's obvious that the Grizz are conceding that they made a mistake by signing Allen. This trade allows them to get rid of his 3 yr deal.
We get a player that already knows the system and, although a bit undersized, has the ability to defend most 3's. Arthur is quietly having a nice year and he's actually a few months younger than Luke. He is in a contract year and perhaps could be a fallback option, should re-signing Baby prove to be too costly.