I really dont think they are going after One Piece, but that could be just me lol. Mihawk has no desire to compete so far, and CG current goal seems to be starting shit with the Marines. Plus, I cant see them taking anything from Teach or Shanks, even with Mihawk around lol
I think it is better not to underestimate the ultimate clown of the show.
His portfolio is ridiculous. Doesnt matter how bad things may seem to be, his luck turns it all to good in the end.
The first big shot Luffy encountered after forming his crew. All the Shanks/Blackbeard childhood is connected to him as well.
Was present in all the big events like Impel Down and the Marineford war. Became a Warlord and an Emperor.
Got the backing of ID prisoners whom Whitebeard himself considered a formidable force that he didnt want against himself.
The man who lost everything and got it all back in record time has got to be important.
I think it is inevitable that he will outlast one between Shanks and Blackbeard, possibly even both if Oda wants to end with a comedy.