I like Fa. I watched a bunch of his fight breakdown videos on his YT channel (I think he might have taken it down now) a few years ago and he's a really nice guy. He had a decent career, was pretty athletic for his size, and had a big heart. Hopefully he earned some good paydays and invested his money wisely..
Do you think he says that when he was unbeaten? Probably not. Just saying. But yeah good for him and solid reasoning. Though I could definitely see him in 6 years time in say a New Zealand heavyweight title fight.
For good? No. But Browne definitely signaled the end. Sanchez was an opportunity to turn things around and while Fa did box pretty well, the end result was as brutal as it was against Browne. That loss was what sealed the deal.