Mike D'Antoni, the guy who coached Steve Nash in his MVP 40-50-90 seasons, called Gallo the best shooter he has ever seen.
His near 90% free throw shooting, according to Kevin Pelton's method of determining NBA prospects future 3 point shooting, might indicate that he is a better shooter than he has been able to show in the NBA.
Gallo is tall, long, and decently athletic. He can pass, draw fouls, and put up big numbers in a hurry.
Add to those things the fact that he is a relatively low-risk get on an expiring contract, and he fills a need on the wing as a shooter for us, and I think this is a no-brainer. In CBS's system, I think he could be a 20 ppg scorer.
If Ainge and CBS are truly interested in moving on from Sullinger, then I would be willing to give him and Turner for Gallo. This trade, if done before the Lee trade and the Crowder signing, would also generate a trade exemption to the Nuggets for about 5 million dollars. I would also trade Bradley for him straight up (that trade would give us, if we renounced the rights to all of our free agents next off-season, to have 65 million in cap space)
At worst, Gallo gives us a scoring forward for a year, and we still have a ton of cap space going into next year's free agency. A player with his scoring and position are more easily traded than Bradley, which makes him a better asset. At best, he turns into the efficient scorer that many people always thought he could be and becomes a fixture on the wing for the next 4-5 years of his prime.