Nope. My top three will always be
1. Rakim
2. KRS
3. BDK
Past that it can fluctuate here and there, but the top three will always remain.
Rakim and KRS were my favorite MCs in high school, and Kane was probably in my top 5-10. But the thing is, Rakim and KRS didn't have much mainstream success compared to the rappers that would come later i.e. Pac, Nas, Jay, Biggie.
When you're rating MCs I think mainstream success and influence on pop culture should be a category. I mean, KRS was a beast, but I can't say that he had the same affect on pop culture as 2Pac or Biggie.
Also, MCs in the 90s and beyond had bigger budgets than MCs from the 80s. They could record in better studios and hire big name producers whereas 80s MCs recorded their records on shoestring budgets.