I always suspected they were going to sign an import with their final roster spot, never believed the Exum talk for a moment.
Exum would be crazy to come back and play in the NBL this season. Best to stay over there refuse 10 dayers don't play in G-League either and hope a team offers him a contract for the rest of the season at some point. Just like Thon Maker played it last season after he was cut by the Cavs early in the season.
If no serious offer from an NBA team the whole season then go and sign somewhere else for the following season because at that point you won't be getting back into the NBA again which would've likely been Exum's fate if he came back here. Look at Broekhoff he'll never get near the NBA again.
The NBL will always be there for a guy like him if he wants to come back towards the end of his career, he's got to think about the next 10-12 years of his career.