Imo he has to be next, whatever factors into the Burned Scar Man and/or he 4th RP needs to involve the Marines due to Ryokugyuu's comments to Shanks, plus Garp's fate with Blackbeard and Kuzan.
In that way, Sakazuki makes perfect sense to fall while Blackbeard makes victories on his own in the same area (i.e. Shanks maybe)