So now Boxers aren't considered effective strikers in your opinion? Mayweather isn't an elite striker in your opinion?
They are effective within context.
Mayweather is elite in that context.
There is no evidence that he's particularly elite amongst the wider category of "striker" though.
Therefore, using him (or any boxer) as an example in a "striking Vs grappling" argument is introducing a handicap against the strikers.
But maybe that's the point?
Keep in mind that this entire conversation started because you were criticizing a person's boxing skills. Now the best boxer on the planet is still inadequate for you. That's a textbook example of moving goalposts in an argument.
I didn't find out he was a boxer until after I criticised his overall skill as a striker.
As I said before, discovering he was "a boxer" only explained why he concentrated solely on the front of his fists.
Being a boxer is certainly no reason for a poor show though.
Thing is, boxing has one of the most restrictive sport rulesets available, and pretty much everyone who trains boxing never trains outside of those rules. It's no surprise that when confronted with someone who is good outside of those rules the boxer isn't comfortable.
With that said, the situation with Mayweather applies to other strikers as well. No one enters the octagon without grappling experience. Further, there's been multiple cases where superior strikers were beaten by superior grapplers. Vice versa has also occurred of course, but Mayweather purposely avoiding MMA fights in these crazy exhibition contests is a prime example of what we're talking about.
Of course 'nobody' enters the octagon without grappling knowledge - it's a contest that relies heavily on grappling.
It'd be like entering a boxing match as a wrestler who can't punch.
That said, there are more than a couple of videos showing people being rejected because they can't or won't grapple.
The jury is out as to whether that's because grappling is so much better, or whether the grappling element is what sells tickets...
A while back I did find a few videos where grapplers absolutely got their asses handed to them by strikers - but I won't be trying to find them again, or post them.
Because they contained pretty competent strikers, and pretty crap grapplers. Even I could tell they were crap.
Just like the vid you posted, it was an unbalanced contest - it's just that I won't even attempt to use it as any sort of evidence.