Vrabel intends to remove the entitlement, so the way I see it is that Chism will have exactly the same chance as Polk to make the cut of 6 WR.
Also, consider Polk was not a McDaniels/Vrabel pick, but Chism WAS signed by them... and... Polk was not only historically bad on the field, but also a whiny baby off it last year. Watch this space for sure.
McDaniels (through BB) definitely has a history of getting a lot out of white skill position guys other teams didn't want.. Edelman, Dola, Woodhead, Welker, Hogan etc.
I'd guess one of Chism, Dippre or Larison make the final 53.