Rodman's role, in terms of setting up the offense, was nowhere near as critical as Rondo's.
Rodman simply maned the boards, played dirty defense on other 3s & 4s, and fed the offensive boards to either Kukoc, Jordan, or Pippen. And the Bull's three scorers pretty much did the rest.
I guess in a way, this division of roles was probably one of Phil Jackson's greatest achievements in getting the late 90s Bulls, into a perpetual winning machine, since the lack of scoring in the 4 spot didn't effect the overall results.
The difference, however, was that the Bull's three scorers were young, healthy, and in their respective primes. The Celts, on the other hand, needed Rondo to be both a playmaker and a scorer because he's the youngest of the *star* players & as we know, our big three has had far more scoring slumps than the Bull's 3 scorers. And even with all the WWF wrestling nonsense, Rodman still shutdown Malone pretty well during the finals.