McCain was looking for a groundswell of support from most of the Republicans, all of the independents and some of the Democrats for a center-right Unity third party or some variation thereof. A "McCain coalition" something like the Reagan coalition. It didn't happen. It may in 4 or 8 years but McCain's time has run out.
Anyway, McCain and Weaver were looking to build a populist coalition. The meetings were real but didn't fit McCain's plan. McCain threw his support to Bush.