Hmm. Not much here that I agree with... yes, you can talk your way out of conflict with a predator, but not in the way most think of as "talking your way out of things". A blindside attack is one launched from an unseen position, and negates any pre-emptive striking (you've already been hit, nothing pre-emptive about what you'd do), so it's not the right context for "hit first", or anything else mentioned. As far as the threat being recognised, I also wouldn't say there's no good excuse for a fight to occur... but we're really getting into the broader range of possible situations, and at that point, the only thing you can really say is that there aren't any absolutes.
Nah, none of those are "best" for self defence... you're getting focused on a physical action, which is not the way to approach it (I've mentioned previously that "the techniquearen't the important thing"...). Within a self defence scenario, each of those might indeed be your best physical tool to apply... but the tool itself is really nothing. If you really know what you're doing, it won't matter too much what you use, as they can all have relatively equal value. For the record, I teach primarily open hand methods as well... but not for the reasons you've listed.
Of course, talking your way out, if possible, should be done. But, if talking isn't working or if there's no time, then a pre-emptive strike should happen. I mean, why wait until the guy's punch is half way to hitting you? His actions of aggression, moving towards me, drawing his hand back, etc., are enough for me.
As for the rest...you're right...what works for me, might not work for you, and so forth. IMHO though, the open handed strikes, as well as a hammerfist, elbow, etc, are most likely going to result in less of a chance for injury to the defender, rather than a closed hand. Not saying a closed fist won't work or isn't effective. I'm simply saying if I use an open hand strike to the guys ear, I'm most likely going to run less of a chance of injury than if I punch the guy.