As much as i want it to just be Shanks, theres just too much that makes sense for it not to be now imo.
Oda has shown this persons face from one side both times, without the scar. Its purposeful.Chapter 1083 and 1121 both show characters that look very similar sillhouettes with cutlasses being held by them, not unlike Shanks. Both Shanks and this person are on 1121's double spread.
Ill still hold out hope, but at this point I doubt it. It made sense before, but to tease the reader a second time here after this sillhouettes and the fact that Shanks just left Elbaf doesnt work imo. Oda aint one for 4-D chess, so tricking the reader on this level doesnt make too much sense to me at this point.