There are also other factors to consider such as fibrosis, and the fact that typically it's the temples that have the most androgen sensitivity, which is why they're the first areas to go. This varies from individual to individual. Not everyone has the same sensitivity, not only in the follicles but also hormone sensitive tissues throughout the body, and not everyone has the same amount of hormones. Essentially, it can also be said that not everyone has the same state and rate of fibrosis.
If there isn't an answer, this hasn't been looked into before. Certainly not from this angle.