well Ayu's themes/eras/peak were very similar to Mariah at some point. (hell, even her "fated/glitter" covers are similar to Mariah's "Glitter") if anything, it's that slobro was pointing. also Mariah can't sing anymore so there's another thing
Koda is like Lady Gaga honestly. Her peak, her decline, the gays being obsessed with her. I guess Joanne throws a wrench into this but who knows how the Era will play out anyways. It's not like koda declined really fast
Since you are so in love with yearly charts.
Style #67 year-end
Walk of My Life #95 year-end
Made in Japan N/A (2016 is not over yet & Ayumi already dropped out. The #100 sold 73,431, more than 30k over Ayu)