Not only the first to join, the narrowest clearly implies that Rayleigh was the second strongest after Roger.
That was the point for Zoro too, he was also be said to be the strongest after his captain.
Right in Elbaph we saw arguments where the pirateking wings been based on their powerlvl:
Wings are based on powerlevel.
Zoro and Sanji are based on powerlevel.
What if Loki joins now? He destroy that part, the wings would lose the meaning because a guy joined, who is far stronger than them.
And one simple logic fail you guys have:
"The powerlvl doesn´t matter because Zoro and Sanji gonna get stronger".
Yes they get stronger at each new island, but what is about Loki?
He wont get stronger? He will stay his current lvl(which is probably already the EoS lvl of Sanji and Zoro or pretty close to it)?
Wont he became stronger? Every strawhat improve, that is the key part of the crew. They all getting stronger.
Loki wont join mate.