Yes!, that's the solutions to all my concerns!
I'd even be easier to implement that all my mission to pull content from same-named pages in the main site as I described here http://wordpress.org/support/topic/unique-post-ids-for-each-site?replies=3#post-2351304
Is there a way to "mirror" a page to the other sites? like a kind of "alias" in Mac OS X ("shortcut" in pc?)
If not, there's a feature request here! :)
I just want the Site's admin not to have to edit tens of pages when could be editing one.