[Theodores]

Well if there are any Google people reading this: ask HR to give the guy a job! He went through all that and he came out positive about it all.

[skj]

So, it seems likely that culture fit was not a problem.

In general if you get one interview that results in a weak no-hire, you need a couple strong-hires to balance it out. If you get one with a confident no-hire, that's it.