They're not signing him to a first-team deal to groom for a role three years from now. He'll start when they need him to, and if he wins a spot, he wins a spot. I wouldn't be surprised if he does; he's an impressive young player and speed can't be taught; plus he's already pretty technically good.
MLS is becoming a modern, selling league. More and more younger talents like Davies, Adams and Alvarez are going to be seeing first-team time.