I’m guessing they’ll be used to hype up the Blackbeard Pirates.
Lot of people downplay Blackbeard by saying he’s only strong against Devil Fruit users which is why the only devil fruit less emperor is the perfect person to take down and prove blackbeards insane power.
As for the rest, Shanks’ crew is just kinda… meh. Once Oda revealed their names it kinda showed he didn’t have a big role planned for them as all of their names are hyper generic, more so than the Tobi Roppo names.