Forget a trinity why aren't we writing a pantheon of metal gods? Yes the trinity is good, but there are more metal gods out there than just those three. Tony Iommi for example? He DID create the metal riff.
Tony and his ilk have transcended being Gods. They are now like so high they don't really need to be here anymore. Their legacy will forever be etched into the psyche of any metal head and/or guitarist.
I think more thrashy. I've only noticed that people have been complaining that even though Dave's come back to thrash the music still isn't thrashy enough. I disagree but he's still going to make each album more thrash than the last I would think.