Rival dynamic btw Shiki & Kyou has "wings opponents" written all over it.
Moreover like a few select Rocks Pirates till now, Kyou has the "later on goes on to become..." intro, so he's being introduced as one of the main hitters of the Rocks Pirates. That and his intro was pretty big highlight in this flashback. Not to mention he was one of the Rocks Pirates that Sengoku mentioned in Chapter "Ultimate". Then there's the fact that he's a axe user.
Main Rocks Pirates as we know atm are:
Rocks, Newgate, Linlin, Kaido, Shiki, Kyou and Ouchoku
By process of elimination:
"Rocks" is Roger's matchup
"Newgate" is implied to have had a confrontation with Garling
"Big Mom" was buzzing around for devil fruits so prolly displayed mercenary type behavior on God Valley (i.e. bailed on the fight since others were occupied and went after DFs instead)
"Kaido" was still pretty much Kaido-kun at this point lol so wings were above his pay grade
Which leaves only Ouchoku, Kyou and Shiki
Don't know who Ouchoku fought on GV but considering he's gotten a bit of focus on Hachinosu and was used as a stepping stone for Teach, I reckon he was created for that very purpose which he's already fulfilled so doubt he tangos with the wings.
So it's gotta be Shiki and Kyou for the wings.