Amanda

If shanks goes after blackbeard and blackbeard uses underhanded tactics then potentially he captures him and luffy rushes to save both shanks and garp from blackbeard, forcing the final battles. Just a thought.

Let's hope so! Let's not forget what blackboard did to Ace and that he told Luffy it was his fault because he was on Skypiea and unreachable so Ace was his replacement. Luffy couldn't take care of him then because he had to get to Ace.

I think this will also give closure to the rest of the crew who met Ace in Arabasta and heard him talk about his duty to take teach down and then being unable to be there with Luffy to save Ace, too. Too much emotion there to let it go unanswered and unavenged for a crew with as much pride in upholding honor and promises.

I think it they dont go this route the story will never feel finished regardless the outcome.