Oda does tbh seem to be making Shanks(and Mihawk) the pinnacles of the series in terms of power
Luffy beat Kaido in Wano and then fought on par with Kizaru in egghead. At worst you can say Kaido is slightly stronger than Luffy, who is slightly stronger than Kizaru. Regardless Kaido isn’t that much stronger than an admiral.
Shanks WiFi diffed GB.
Big Mom, Kaido’s equal, was 2v1ed by Kid, who was one shot by Shanks.
I feel like if you take these feats alongside the fact Shanks captured Loki, even if we say that maybe, Shanks didn’t 1v1 Loki(even though he probably did). It still paints an overarching picture of Shanks as a near Joyboy tier character who probably stomps Kaido, BM, and most admirals.
Same with Mihawk, who is one of the few people confirmed above Shanks.