Btw, the only reason I don't think it's Shiryu who went to WCI with Aokiji, is because both Shiryu and Aokiji are "sus", per what Burgess told Teach during that Dressrosa call.
I would send Aokiji alongside one of the "OG" crewmembers. Since most of them are fighting Law, the only one left would be Lafitte, who's shown to be one of the most fiercely loyal members.
Lafitte's hypnosis is also a great tool to easily find the location of the Road Poneglyph there.
Stealing Law's Zou and Wano RPs, that would put Teach on the same step as Luffy, each with 3 RPs.
I would send Aokiji alongside one of the "OG" crewmembers. Since most of them are fighting Law, the only one left would be Lafitte, who's shown to be one of the most fiercely loyal members.
Lafitte's hypnosis is also a great tool to easily find the location of the Road Poneglyph there.
Stealing Law's Zou and Wano RPs, that would put Teach on the same step as Luffy, each with 3 RPs.