I select 2, the same reason with Jack.
Now Boston is 6-0, and I have seen 3 Boston games. They really hard to lose.
Besides "GAP", although other players are not so outstanding, they all know how to do their best to support the three big guys, especially Scalabrine and Rondo. They both have great spirit!!
Moreover, I found an interesting thing: The "GAP" can cover each other in game. For example, last night they vs. Pacers, Ray Allen get 0pt in the 1st half, but he hit 17pts in the 2nd half. I think that is because he is not the only key player!! KG and Paul can give him space to adjust himself.
I have seen the situations like this several times. That why I say they are hard to lose.