Hmmm...I don't know what to say. The requirements / check list is very precise and straight forward, so it's either you submit these papers or you don't. Perhaps it's how the brother composed himself while at the Embassy? Any embassies will feel suspicious of nervous tweeks even if they are just the way they are? Anyways, these are all speculations now, but it's bad that happened and hopefully he gets a visa later on when he decide to try again. :-)