Chach,
I'm not sure if english is your native language or not but your post was very difficult to understand. There were many statements you made, or tried to make, which did not make a whole lot of sense.
Some points:
First, tire flipping will never be a plyometric exercise no matter what the speed may be. For an exercise to be plyometric it needs to have a rapid amortization phase, less than .15 seconds by Verkhoshanky's guidelines, so regardless of the speed of the flip it will never be plyometric by any means. Tire flipping doesn't even really have an amortization phase since it essentially starts out of an isometric position.
That said, however, tire flipping is an explosive hip extension movement with a horizontal force component that is a great exercise for fighters and is plenty specific to MMA regardless of the tire weight or speed of the flip. It has plenty of uses in different phases of training for a fighter. You are confusing external movement speed and motor recruitment principles, among other things.
Second, I'm not quite sure where you think the sweet spot is between "power and explosiveness" but perhaps you could elaborate on just what the difference between the two are? And where is this sweet spot exactly?
I have absolutely no idea what you're talking about when you say that exercises that incorporate large muscle groups for power/explosiveness may end up incorporate slow twitch and retarding explosiveness. Slow twitch fibers fibers are fired in every resisted movement as they represent the lowest threshold motor units.
Lastly, the ACSM wrote the book on what? The ACSM is mostly for people who want to work in a clinical setting and focus on high risk cardiovascular patients and such.
Most of your post is gibberish but again I'm not sure if this is what you are intending to say or english is just not your native language. Either way I would check some of your statements for accuracy before making them.
With regards to certifications, as I said in another post get whichever one will get you the job you're looking for. If you want to work in a hospital or clinical setting, get the ACSM. If you want to work as a strength and conditioning coach, get the CSCS. If you want to work in a health club, most will be just fine with the NASM, or ACE. None of them will teach you anything aside from the basics and don't mean much of anything. I had both certs from the NSCA and two from USAW but I let them lapse years ago.
