Someone far stronger than Zoro and Sanji, wont join.
Love the Loki wank

but would say to hold your horses on this.
Loki is undoubtedly very strong but how strong he is in actuality is still a mystery.
Moroever you gotta keep in mind that Loki is just 63 years old which is 21 years old in human years (coincidentally the same age as the wings) so he's most likely not even peaked yet. Hell his conversation with Gaban in the underworld prior to the flashback strongly implies growth for him. You also gotta keep in mind that albeit very formidable at the time, Shanks was six years younger than he is now when he defeated Loki
So whilst I acknowledge that Loki is most likely stronger than the wings atm, I reckon they'd be able to encroach on his level with a significant PU which is strongly implied this arc. All of the above considered I don't think Loki is as strong as the likes of Kaido/Shanks at least not yet.
Also keep in mind that Loki could also potentially get nerfed if he let's say loses Ragnir for example