#5 UFC 178 – 09/27/14
Original main event: Jon Jones vs. Daniel Cormier
Replacement main event: Demetrious Johnson vs. Chris Cariaso

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When longtime – and still unbeaten – Heavyweight contender Daniel Cormier announced a drop to 205lbs in early 2014, fans immediately began to salivate about a potential match between him and UFC Light-Heavyweight champion Jon Jones.
And sure enough, after Cormier beat Patrick Cummins and Dan Henderson in one-sided fashion, the fight with Jones was signed for UFC 178 in September.
The event looked like one of the all-time great shows, too – with rising star Conor McGregor facing Dustin Poirier, former Bellator champ Eddie Alvarez making his UFC debut against Donald Cerrone, former Bantamweight champ Dominick Cruz making his return, and the likes of Cat Zingano and Yoel Romero fighting on the undercard.
After a press conference ended in a shoving match between the two, the Jones/Cormier pairing became one of the most anticipated fights in promotional history, but then disaster struck.
About six weeks out, Jones injured his leg and had to withdraw, and the UFC decided to replace it with a fight initially booked for UFC 177 – a Flyweight title fight between Demetrious Johnson and Chris Cariaso.
This was a total damp squib as not only was fan interest in Johnson – and the Flyweight division – low anyway, but Cariaso was a non-entity as a contender and was only given the title shot as nobody else was available.
It represented probably the first and only time in UFC history that there were around five fights on the card with more fan intrigue than the main event.
In the end, the show was a massive success as almost every fight ended in exciting fashion. But sadly by the time the main event came around, the crowd were dead – a combination of not caring in the first place and exhaustion from the action of the previous fights – summing up the feeling surrounding the fight.
Johnson easily submitted Cariaso with a kimura in the second round, and Jones ended up fighting Cormier four months later at UFC 182.