Oh, this is a place we can also appreciate Rayleigh?? Melikes.
I've been thinking lately - this was probably discussed a million times but I'll say it anyway - what if Zoro cut his own eye to become stronger or something? Not quite Fujitora level blind, but pretty close. Fujitora did it to "not see injustice" or whatever, but it must have also served to sharpen his other senses as well as perfect his haki.