Question: Do you feel its possible to defend something with no knowledge of it? For example: the MMAist, AFAIK, does not train weapons. That being said, how do you train something you're unfamiliar with? If a TMAist, who has no knowledge of the ground ends up there...well, we've seen what happened to those one dimensional fighters in the early UFCs.
Too a limited extent. And it goes both ways. Fighting against weapons is hard enough with training, without it will be even harder. But, most stick fighters aren't familliar with MMA fighting. And in the case of a stick, I think it would be a matter of whether or not the MMA fighter could clinch or even go to the ground. A knife would be a whole other issue.
The thing that happened in those early fights, and is often "overlooked" is that while the Gracies and others where not great strikers, they did train it, and more specifically they trained to use there game against someone trying to hit them. Where the people they fought had less knowledge of grappling then they did of standup striking, and did not train to counter it.
Take, for example, the Hackney vs Yarbourough fight I posted. I imagine part of Hackney's training did not involve "How to fight a 600lbs Sumo wrestler", but he managed. And Yarbourough on the other hand probably didn't devote much time to "How to fight someone that is punching you in the nose"...
So if a MMA fighter faced a stick fighter that trained to keep range, counter and break out of the clinch, avoid takedowns... well, the betting odds just got a much bigger gap.