Maximum# of fingers is strain dependent.
Whether the plant acheives that # has to do with age, budding status, and stress level.
A young plant takes a while to max out its blade count.
A budding plant will go back to 3 and then 1 blade leaves at the bud site.
A happy plant will grow max # of blades
A revegging and/or highly stressed plant will revert to single-bladed leaves which may or may not even bear serrations or resemble cannabis in any way.