When a card is correctly stacked with enough significant battles by name combatants, blemishes disappear. They are still there, obviously, however they take on an infinitely more favorable complexion.
The key event is an ideal example. Here is the replacement to Jon Jones vs. Daniel Cormier (and Alexander Gustafsson before that), which is to say it is no replacement at all (in equity, not much is). However, using the people’s guy occasion being Conor McGregor vs. Dustin Poirier and the remainder of the card offering every type of fight fan something to whet their appetite, the primary event transforms from an underwhelming anchorman to non-outrage bonus offering.
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UFC 178 fight card: What Is at stake?