I thought so, too. But no news today on Tony makes me think he may be sitting against Dallas, no matter what. I think it's better to rest them all than split them. If he holds them out against Dallas, they get some extra rest now, and then it's just two b2b's with a day off in between. And all four of the games in the b2b's are the kind where the Spurs could get enough of a lead to give the Big 3 some second half rest.
I know a lot of people won't like it, but I'd sit the Big 3 against Dallas, and just play normal in the next four games. Count on having Jackson, and so not needing to play Manu big minutes on the second nights - but not plan on sitting him totally on those second nights.