So has a definitive explanation for stimulant-neurotoxicity been given?

[HOOH]

Stimulants and their neurotoxicity, is a weird thing.

Amphetamine has low neurotoxicity, but methamphetamine has high(er) neurotoxicity.
DOC has barely any, but 4-Chloro-Amphetamine has high neurotoxicity.

And it's even weirder with the emphatogens.
MDMA and MDA have both high neurotoxicity, but other MDxx drugs, such as MDAI have low.

Is there any sense to the distribution of neurotoxicity amongst the stimulants?