Man my fucking PC crashed lmao.
It wasn't about capturing Luffy, Ryokugyu was sent by Akainu to keep a handle on the fall out of the Onigashima war.
No different from Kizaru offering to go earlier or Sengoku being sent when Roger & Shiki were about to clash.
Ryokugyu just additionally went ahead, negged the two YCs and tried to bring Luffy's head back to Akainu to surprise him.
He explicitly even tells the Marine fodders to not say a word about this to Akainu.
Talks about travelling to Wano again after Kaido was taken care of. Pretty straight forward.
Thats the thing.
Nobody wanted to go to Wano cuz they'll have to deal with Kaido.
I've always had Kaido > Shanks though...