Personally I cant agree because theres clear dialogue from Marines fighting Red Hair Pirates (Ryokugyuu) and Blackbeard's side (capturing Garp) to where I personally think this is leading to a bigger war that will result in these factions squaring off separately against one another (i.e. RHP vs BBP and SHP/Fleet vs Marines) first.
Plus, Luffy and Shanks justifiably should be meeting before anything happens with Blackbeard and Shanks, imo
Tbh the Ryo line imo is no different from Luffy saying he’ll beat up BM. Just a throw away line.
To me this arc definitely ends with BBP vs RHP. Afterwards both BB and Luffy will have the location of the fourth poneglyph:
BB from Shanks who got it from Gaban post Wano
Luffy from Gaban directly
Then they’ll fight at that location (likely god valley seeing how much odas building up the location)
Then the marines will try to intercept Luffy at the final island before raftel (lodestar) like they did at the final islands of the east blue (loguetown) and grand line (sabaody)