When dealing with two sites you want to cross promote there are certain linking structures that will give you the most bang for your buck. Two sites that are fully meshed will result in the higher PR site having it's PR lowered and the lower PR site having it's PR raised. So unless you want to sacrifice some of the first site's PR to help the second site you shouldn't fully mesh two sites.
If you're purposely trying to siphon off PR from one site to help another there are better schemes than fully-meshed cross-linking to consider. If the site that needs the PR doesn't link back to the one that is sending it the overall benefit for the site that needs the PR will be larger.
By sending it's received PR to it's sub-pages and then back to its homepage Site B is almost effectively doubling the PR that it's homepage gets from the Site A link. This same PR structure can be used to launder PageRank.
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