Why? Honestly, I'm asking.
I don't see the fit for him with the current roster distribution, but open to being swayed.
In my opinion he seems unlikely to earn a significant role next season --- at the very best case scenario, he's competing with Poole, Brooks, and Watson for one reserve slot in the rotation, with the most likely outcome seeing Barrett as 4th option of those four (still for one slot in the rotation).
And then in 2018-19, when DeJulius comes on board as a probable FR reserve PG, the roster still has Simpson as JR, Matthews a R-JR, Poole a SO, Brooks a SO.....where does Barrett project in those plans?