I agree with SalvorHardin
"an unstoppable force has detonated the fleet and everything it stands," it sounds metaphorical. What is the purpose of the Fleet? Pike describes Starfleet as a "peacekeeping and humanitarian armada".
Cumberbatch (and perhaps with the section 31) has detonated the Fleet as armed peacekeeping, divided in two factions (pros and cons. war), discovered a powerful weapon and is trying to invade the Klingon Empire.
If it is right he could be Garth of Izar.
Garth of Izar was an underexplored character in TOS and he can be modified to become someone with some superhuman abilities, not like Mitchell, but like Khan.