ok...I promise not to mention the:
shared sponsorship deals.
the collusion of both to leave for the EPL / Atlantic League.
the 11-1 SPL voting rights (in which both never vote against the other.
the mere fact that they are known as the "old firm" (suggesting association)
Its a bit like Stalin & Hitler - one being far Left the other being far Right - yet their policies were pretty similar.....funny that !