No, Rei, YOU are truly beautiful.
You were brought into the club even when you didn’t want to at first, you trained with them, you made memories with them, they became your friends. But they were stuck in the past “Rin-chan! Rin-chan! Rin-chan!”“I wanna swim with Rin-chan!” and you never showed it, you never let it effect your friendship but everyone else could see that it hurt you, you felt like the odd man out and, really, you were. That’s not easy. But you swam with them in relay, you saw what it was like, you felt like a part of the team for the first time since you had joined! And you wanted the team to go far! You wanted to swim with the best team you could imagine! You trained so hard to not let them down, and Rei, you didn’t let them down. You gave up what you wanted because it made Haru happy. But not only Haru, it made the team happy. You sacrificed all your hard work, so your team could be happy. You put them before yourself because you knew, that you could never replace Rin’s spot, but as Nagisa said “Every team member is irreplaceable”.
Rei, you are the truly beautiful one. I’ll drown anyone who says otherwise.