The boat builder Franky was already on the radar of CP9 and would have been tortured, as well as killed by them, had Luffy’s crew not intervened. There’s no doubting that Franky was pretty strong when the Straw Hat’s found him but not strong enough to take down all of CP9.
Brook is the only one that wouldn’t be dead. However, that doesn’t mean that he would be living happily either. Brook sadly would likely still be on his broken ship in the Florian Triangle, alone and forgotten. Saddened by the constant memory of his fallen friends.
More on page 5.