I am not doubting his ability to feel things that I can't... just wondering how critical it is? I know that flaws show up once the shiny clearcoat is applied that aren't visible in flat basecoat. I would accept some flaws in a DIY job that I would not in a $3000 (plus $700 BC/CC) professional job.
Also, the previous attempt was single-stage. It won't have the deep gloss that a BC/CC job would - on the other hand it's simpler (and less expensive) to apply, and some errors can be repaired with appropriate sanding and buffing...