Giyū fought Akaza, was the first hashira to encounter muzan, and after fighting muzan, he was the only person up to hold back demon king tanjiro. When he fought Sanemi in the pillar training, they seemed even and none of them had the advantage. Sanemi was going all out and Giyu wasn't because its later confirmed in chapter 149 that this is the first time Giyu goes all out (That was against Akaza) and that it was first time being overwhelmed after a long time. Giyu lasted longer than Rengoku in a duel against Akaza and traded more blows. He also took on "end style" (Akaza's most powerful move) at point blank range yet still blitzed him afterwards. He also fought Muzan till the very end and was the only pillar left fighting against Demon Tanjiro AND SANEMI WAS LITERALLY SLEEPING?????? ALSO HE'S LITERALLY A PIECE OF ART LIKE HIS HAIR AND EYES AND THE WAY HIS IRISES ARE A DEEP SAPPHIRE THAT FADE TO LIGHTER BLUE WITH BLUEISH BLACK PUPILS AND HES NOT OVERLY MUSCULAR. I love him so much ❤️❤️