Do you remember how Conor McGregor got a defeat from Dustin Poirier? Did we expect it? Unusual things are happening in fighting currently, so studying these players' current performances and watching only is the best option for now if you are not sure who to bet upon.
Yes, we didn't anticipate that coming and that's the option that we can do. Bet and watch, nothing more and nothing less. The disappointment of others from that match would even change later on.
And just move on to whatever had happened on that match.
Who really cares anymore.
Every fighter loses eventually.
No one stays undefeated unless they retire that way.
There will always be those who want to come after the belt for what ever division or weightclass your in.
McGregor was a prime example of this and his attitude suited having a belt saying he will take on all takers for his belt.
Because to honest, he didn't give a fuck.
Another huge example could be Ronda Rousey as well, that was even more perfect example than anyone else. She fought 12 times and won all 12 of them, had 9 of those 12 games be finished under 1 minute, that's crazy stats for any fighter ever, another game ended at 66th second so she nearly beat all her opponents instantly, and 4-5 fights end under 30 seconds as well.
Basically she was the perfect fighter that nobody came close to beating, she destroyed all her opponents, she was doing better than anyone ever expected, last 3 fights of her before she lost was ended in 16 seconds, 14 seconds and 34 seconds, then suddenly she lost to Holly Holm and then to Amanda Nunes as well and just retired after that.
This is the perfect example that nobody can stay undefeated unless they just retire, it is like gambling, you may get lucky and have a winning streak but you always end up losing if you keep fighting.