Re: Display bbpress on wordpress page (inside the blog)
Even BuddyPress.org uses deep integration, so I think that for right now, the only way to tightly integrate the two platforms is to use deep integration.
Maybe tomorrow there will be a universal theme directory, and underneath that will be buddypress themes, bbpress themes, and wordpress themes, with wordpress mu sub themes for users.
There are ways that you can make a plugin for one application to mimic what the other application does, but for things like the BuddyPress buddybar, there’s no way to load that without loading the BuddyPress classes and functions, and you can’t get that info without the WordPressMU classes and functions on the ready.
Basically different strokes for different folks.