Sashimi identification help?

Hi everyone, hoping I could get some help identifying some sashimi I had in a seafood rice bowl whilst on holiday in Okinawa, Japan, from a food court stall in a public market. I unfortunately didn’t snap a photo where you can see it clearly but have attached some pictures found on the web where the fish looks similar!

The fish I had was very opaque white fleshed, firm in texture. Had a similar texture to tuna but was very oily in mouthfeel, though didn’t have a strong flavour otherwise. From similar posts on this subreddit where people have asked about similar looking fish, people have answered escolar or squid/cuttlefish, but given it was at a seafood market in Japan I think it would be unlikely to be escolar, and it didn’t have that snappy or chewy texture squid does. Any ideas? Any help is appreciated!