There's one tiny detail missing in the translation. Rin told Ayumu that he and Takeru are called the strongest of the "Furinkazan" (風林火山). Ayumu is represent mountain (as he's called "Tanaka the Immovable") while Takeru is represent fire. And since we need two more character to represent wind and forest, so Rin will represent either wind or forest but only time will tell which one she is.
@BasilD
Rin's name in full kanji is 香川凛 (Kagawa Rin).
Edit: Oh, this is Rin Kagawa artwork from Yamamoto-sensei just released a while ago for Chapter 72 promo:
https://twitter.com/udon0531/status/1298453581205393408
Great, the "character says something obviously misleading so the audience gets worried and then reveals that it was a misunderstanding", to add to the list of cliches