I'm keeping a watching brief.

As far as I'm concerned BBR is still CZ's coin until he declares otherwise.

CZ built this coin from the ground up and has extensive knowledge of the Cryptonote protocol. His credentials are not in question and has proved himself. His request that you prove your competence with the codebase and contribute to the BBR repository seems entirely reasonable.

CZ is also right to suggest people be wary of downloading third party BBR builds that are not endorsed by him.

Whilst I've got no reason to doubt your integrity or intentions. The fact is this project has been going for over 2 years. Primarily on the strength of CZ work and talent (along with contributions a couple of others). You've been here for around a month.

Earning CZ's trust/ goodwill would go a long way towards helping you earn your stripes and inspiring trust others.