I still think each number should be divided by the number of albums and singles. Otherwise one huge album like 21, Fearless or The Fame will instantly put you out sooner
For some strange reason, I believe Kelly will be in the middle due to her longevity of her songs thanks to the AC audience.
Kelly had/has incredible longevity. She wasn't #4 on the Top mainstream artist of the last two decades for no reason. P!nk as well. They have the HAC and AC audience to thank for that.