It's not about the average as some of those stats are simply not as important as others e.g. kicking. Hence why no division was done.
Its all about the average of the stats, if you wanted to have some average for someone then you should change their stats xoxo
It's not though. I didn't take into account certain stats because they're less important the rating is mainly focused on the gf/dl ratings with a few others taken into account but less so than the main two stats. The overall rating isn't an average it's how strong the player is overall and if a player doesn't chamber or doesn't kick it doesn't mean they cannot be a high rated player simply because those two stats don't always matter based on playstyle.