I think you are completely correct - Scott is playing the game - With last night's episode, Beau tried to start up an argument with Dave. Supposedly, Dave was "whispering" to Scott about who to take on the boat excursion. Scott just said something like "drop it" to Beau and then walked away from the situation.
I think Scott is trying not to be a target of both groups. And that really makes sense, let both groups boot each other off and then you'll be one of the last ones standing. Then, if the eliminated guests get to vote, you might win because you were the less hated of the group.
(So if the originals were voted off, they would not vote for the Barbie team and the Barbie team would not vote for the originals if they are left - leaving Scott/Holly (or Melanie) to win (even though he's technically an "original) - If I was Scott, I would tell Holly or Melanie to not name call or argue with the Barbie team - Let Desiree and Amy do the dirty work, that way the Barbie team would vote for Scott in the end.
As much as this is a good strategy, it won't make him popular with the TV audience.
Tony