I'd agree on the last line there.
I mean, I think if Khan is it.............it's a kind of simple enough idea of he would be discovered by others (Klingon's?) and awakened by them. So it's like 'what if.......Khan made it back to Earth first instead?'. Although what red foliage covered planets, volcanic interiors, 'family', Starships rising from oceans and how he would have the ability and knowledge to (seemingly literally) bring down the fleet all have to do with it would all be very unclear.
Unless he's actually neither!
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist