First, to answer the question: yes, we can win. The team is at its best when Perk is doing the dirty work, and the rest of the team is scoring.
That said, one of the things I thought was interesting in yesterday's game was that there were a few times when Perk had good position, and was calling for the ball, where Rondo just ignored him and passed around the perimeter. When Perk has a mismatch inside, I'd prefer to see the ball fed to him. Overall, I can't fault the game plan or Rondo's decision making, but that's one area I'd like to see improved.