Kimimaro is definitely top 15 (proof)

[metallica9565]

I hope youre kidding... he's nowhere near top

 

[Tazzilla88]

All Kages ( he might stand a chance against Mei), 12 people not including Mei 13 with her. Jinchuuriki's not including kages. that 19 or 20 people now. Akatsuki that's 28 or 29 people. The other two sannin 30 or 31. Sharingan users 34 or 35 people. I think my point has been made.

 

[Obito3631]

All Kages ( he might stand a chance against Mei), 12 people not including Mei 13 with her. Jinchuuriki's not including kages. that 19 or 20 people now. Akatsuki that's 28 or 29 people. The other two sannin 30 or 31. Sharingan users 34 or 35 people. I think my point has been made.

No just no, Mei would melt him and his bones

 

[Tazzilla88]

No just no, Mei would melt him and his bones

The only reason I'm unsure for Mei is Dance of the Seedling Fern. I'm not sure how she would choose to react.
Though you're right probably wont get to that.
Water Dragon Jutsu. Lava.
Mist would leave him blind. Yeah Mei wins