Colton is my guy!
I watched him last year in Turkey. Yesterday was the first full game I watched of him in his new club in Spain - against EFES in the Euroleague. Barely played due to foul trouble and the other center - Mirza Begic having a day.
Onto your questions - he is on a 1-year contract in Spain and we still have his rights.
I am not sure if we can bring him back but I am sure it makes no sense. Do not let the highlights fool you - Colton is no shot blocker, very limited on offence and still fouls a lot on D.
His thing is rebounding, hard screens and big men D. Hustles a lot, but is still slow when covering pick and roll. Slow help defender. Think Cole Aldrich, Aron Baynes, etc..
I think right now we are getting all of this on Colton's level and more with Zeller.
Don't get me wrong - I like Colton a lot - all hustle, hard screens, a rock in the paint. Depending on his progress in Spain (P&R coverage and fouling) and roster situation after the draft, I'd love to see him get some situational minutes in green.