The idea of Smart and Rozier together is really enticing. As of today, it seems like Smart has more on the PG mentality, offensively, which is fine because he can guard SG's and Rozier can handle the ball if the opposition puts a real ball-hawk on Smart (I'm thinking about Iman Shumpert giving Smart some problems in the playoffs last year). It seems like it could be a really perfect fit of both players covering the other's weakness.
And that kind of makes Avery expendable. If Rozier can, indeed, translate these skills to the NBA (and it might be a year or two, remember) then we have two really good PG defenders and Avery is the worst offensive player of the trio.