Vasquez or Rivers, River or Vasquez.... may be Roberts?

If Vasquez or Rivers start as PG on day 1 has been a long discussion over the break, so far after 3 games, Rivers has looked much better as SG but a long way from a starting PG position. Vasquez has looked very much like a back up PG. Roberts on the other hand has surprised with his offense, and in the last game with his 8 assists and only 2 TO (plus a nice 16 points) like a more serious candidate for starting PG. moreover, Monti appears impressed with him in his last interview. Do you guys think Roberts is potentially a serious option as starting PG?