Just thinking it may be more beneficial to have the links more as an a b c (pagewise at least) instead of direct in case any straight recip penalty may occur. Prolly nothing to worry about currently, but if you end up with 5,000 freesites all directly linking to and from the same page maybe it will get noticed or a penalty.
I have no proof so take it for what it's worth, but if they implement a recip penalty in the future it may be better to link this way. I am doing it now on my sites, but had done index link backs and more. As my freesites grow i'll stop index links and go with main links. Plus, if you have doorway the main page seems to get more longterm and overall traffic.
I'm in no way an seo expert so it's just my personal thoughts.
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