You seem to be suggesting that the horn means that the fellow in Afghanistan can't possibly be Big Boss
No, I'm just saying there are good reasons to suspect a switcheroo, there.
Do you think that the real Big Boss is still in a coma in 1984
How would I know? Could be in a coma, could be in hiding for some reason...
and this new guy is going around pretending to have just woken up?
I don't think he would be pretending. I think he would have to actually believe he's Big Boss. And that might just have something to do with this possibly imaginary "Ishmael" guy.
Why did the instigators of this plan to make a Big Boss body double wait nine full years to put the plan into action?
Depends on what that they'd be trying to accomplish, how difficult it would be to turn another guy into a Big Boss double...
[And boy, if you think the double theory is ridiculously far-fetched, I may have far worse right here: what if Kojima is actually *gasp* planning ahead a tiny bit, there? I know, I know. I don't quite think that's likely, myself.
At some point down the road, Big Boss will have to be
both back in the States as the Fox Hound commander
and at the head of Outer Heaven. And I guess a second Big Boss might actually come in handy, there...]