I haven’t been tracking NBA moves much, but I thought he was a weird fit in Washington. The Smart buyout suddenly makes him more valuable there.
The Smart buyout really has no impact. Washington doesn't, and never was going to, have real room for him. They had to release/buyout three guys (Smart, Richaun Holmes, and Blake Wesley) who are experienced NBA guys just to get down to the 15 man roster limit and already have signed guys to all three of their two-way spots.
He might have been thinking it was one of his better options to show something during summer league however. Keshon doesn't look like a guy who teams will think is worth a two-way right now. He definitely could get on a g-league squad though and see if he can play his way to that level. That or go the Europe route.