I know he died almost twice and was saved only because of others, but he still managed to do what no one else could and save Ace. This is after being hit with the poison and then healing, with no rest. He wasn't at his best. Now, not only will Luffy be in better shape, but he's stronger and much better than he was. I think haki will help him stand up to the Admirals. I think you're underestimating Luffy too much.
Well, now it's a completely different moment. I mean in the moment of war, which I thought the OP was :O
Vhat doth thou mean? O_o You thought the OP was talking about SHP at the time of the war between WB and the Marine/Shichibukai?
Even then, had Luffy not experienced Impel Down, he'd have done much better. Until he faced the Admirals, Mihawk, or the Pacifistas.
i think they would have rescued ace quicker but in the end ace would still get suckered into fighting akainu and quite possibly would have died and which would have taken luffy out of the action and then the other sh might die trying to protect him from akainu. if akainu didnt manage to kill ace, he would have gone nuts as soon as bb showed up with likely the same consequence. same thing would happen with wb he would die imo. it could all quite easily go to shit though if one of the weaker sh got targeted by a big shot.