I think he is ok at this level, makes a few basic errors/ poor passes each game. He would need to work on eliminating those to go higher
TBH I've not seen him have a brain fart for AFC yet. A League is probably his level or maybe a league marginally better but I still think Bindon and Surman are better.
Bindon has the highest ceiling of all and I can see him ending up better then Nelsen who was still playing football in Canterbury/US Uni at Bindon's age.
A Pijnaker brain fart was what led to Ishige's point blank miss in the first derby. He's definitely been less error prone than expected though.