At this point, I think these are the contenders for the final round:
Caroline (Team CeeLo), Matthew (Team Christina), Jacquie (Team Christina) and James (Team Adam).
Tessanne Chin is like Judith Hill from last season -- too good to show any signs of growth or change -- so eventually she'll get voted out.
Caroline could fall short too since artists who sing like her don't really change much from song to song (although her confidence seems to be soaring) and people could get bored.
I don't think anyone on Team Blake will win, but there could be a chance for someone like Cole to pull a Swon Brothers and just pick the perfect song week after week and make it advance really far.
And then there's Adam, who will decimate his team by picking crappy songs for them to sing.