After deeper research into ‘proofs’ of Craig Wright being Satoshi Nakamoto - it turned out that his signature is worthless. And here’s why - http://cointelegraph.com/news/why-craig-wright-is-not-satoshi-nakamoto
So why would Gavin Andersen say that Craig Wright is Satoshi Nakamoto:
1. Gavin was tricked into thinking so
2. Gavin was hacked
3. Gavin is a liar