Unresolved

Training of max out drivers

Hello,

If your driver has been fully trained, there is no benefit in continuing to train them. 
A very long time ago, driver skills used to atrophy over time, however, I think this waa removed by the developers when the game was published as an app. 
Due to a lack of driver atrophy, a fully trained driver will always be a fully trained and stats will not drop if you stop training them.