My thoughts are that you don't need to be skilled in all ranges of fighting, to be an effective fighter, or to be able to effectively defend yourself (these are not the same thing, by the way).
True, they are 2 seperate things. Perhaps I should have been more specific but for the sake of the thread, both fighting and SD could be looked at. In the ring, well, we all know the importance of that. SD purposes...well, you could be the greatest boxer on the block, but should you find yourself on the ground, depending on the postion you wind up in, those great punching skills could go right out the window.
Of course, there are also people who think that they will never end up in a certain position. How they can predict that is beyond me, but anyway...
You do need to be very good at applying your skills against people who might try to attack you using different methods and different ranges.
And IMHO, part of that is being able to understand how those people operate, in which case, looking at something that specializes in a given area, may be necessary.
Just a friendly observation, but I think you've been having the same discussion over and over for a while. If you enjoy adding BJJ and escrima to your kenpo, then have at it. If you feel it adds something to your skills and your enjoyment of the arts, you don't need anyone else to validate what you are doing. If you feel that your approach is somehow "better" or more realistic or smarter than others, that's also fine.
But not everyone will agree that this is necessary. I don't say that it's a bad thing to do. But I do say that it's not necessary. You can be very very effective by concentrating your skills in one area, and learning to apply them against all others.
One thing that I've never done, is say that people need to drop art 1, and take up arts 2 ,3 ,4 and 5. I've suggested and encouraged that people keep an open mind and look at what else is out there. Sure, some of the recent discussions, have been on a similar wave length, but I guess thats the nature of the draw.
As for talking about my arts that I do....I simply do so because a) I enjoy those arts, b) those arts are great at what they were designed for and c) to simply use as examples. Many times people will ask about crosstraining, what arts go well together, so I use mine as an example. However, those arts again are just examples. There are many things that I'm sure will blend just fine.
Do I think that my approach is the best? It works for me, but to each his own. I dont claim to have the market cornered on the best mix for SD. Again, anyone is free to do as they choose. Then again, there are others that share my thinking as well, so I guess its safe to say that its just not a case of me talking about it, but others as well.
As far as this thread goes, I simply found a comment that someone else made, interesting, and thought it would make for good discussion.