All of mine are cross linked, and the newer sites point to my main site w/o a backlink. Latest update (this month) was very favorable to my main poker portal, and to the new mini I made that points to the main site. I have had my sites cross linked for over a year. They share the same i.p. except for one that is on a dedicated i.p. Who knows what is the "correct" way. All are relevant to each other, my hosting site does not point to any gambling sites nor the gambling to it.
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"People who are unable to motivate themselves must be content with mediocrity." ~Andrew Carnegie~