On a side note, if I'm not wrong I guess you meant either that: 1. His lack of [...] is really high. ( Does this make sense?) 2. His understanding of[...] is

On a side note, if I'm not wrong I guess you meant either that: 1. His lack of [...] is really high. ( Does this make sense?) 2. His understanding of[...] is really low/poor. Cheers :p