His language barrier arguably is one of the factors preventing him from changing his lurker AI all-round.
I think if he tried to townlead in his next town game despite him maybe having awful grammar it could benefit his faction greatly.
Overall I find him proficient in his current AI, I would encourage him to try and vary up his playstyle so he can try new plays as scum without immediately getting FOSed, I think this would lead to more dynamic interactions and a more engaging experience overall.