Understanding statistic simulations in Football Manager 2022

I'm recovering from a bad accident a few months ago and now I've been obsessed with Football Manager and simulation, statistics, etc.

[https://fmstats.com/2022-03-14-ambition-determination-professionalism/](https://fmstats.com/2022-03-14-ambition-determination-professionalism/)

This is an amazing article that tries to explain how the 3 attributes professionalism (most important), ambition and determination affect player's ability growth.

But I don't understand some texts in the article:

>*"In other words, a player with 10 professionalism, 10 ambition and 10 determination (gain of 20.5 ability points after 3 years) will develop* ***a bit …

datascience football manager simulations understanding