Anyways the design goals of Krav Maga seem to me to be to make something that is easy to teach quickly to groups of people that is reasonably effective in nasty situations those groups are likely to encounter. Groups like military and police. The goal isn't to make great fighters. It is to help a police recruit with only 120 hours of training survive the guy who pulls a knife while resisting arrest. As long as it does that, it has succeeded. And right now most police departments and multiple military forces are convinced that it is good for that.
In terms of teaching MMA central ideas, I'm not sure how it could possibly do so. Since Krag Maga is derivative of virtually everything else, it doesn't really have many original ideas. Its focus on dirty strikes is not allowed in MMA. And professional fighters don't particularly need their lessons carefully broken down for ease of learning.
On your related note, I'm not sure why you thought it relevant. To make my point I talked about the MMA style that I thought would be least useful in the hypothetical bar fight. That doesn't mean that all MMA styles are going to be ineffective against multiple opponents. For instance kickboxing offers a lot of ways to take someone out of a fight fast without leaving a big opening for his friend to attack you. Therefore it is unsurprising that a pair of top kickboxers took out a much larger number of opponents in a fight.