The team that worked for Bush in '00 have moved over to McCain (already) to help him prepare for '08. To me that signals the RNC is trying to give us one candidate in '08 as they tried to do in '00 before McCain muddied their waters.
Since, in my opinion, the powerful people in Bush's campaign were Karl Rove and Karen Hughes, I believe the inference that the media made that all these important Bush people were supporting McCain is simply the usual MSM pushing of McCain as a candidate.