I just went through Google hiring committee for SWE (assuming L4) and I was told beforehand that I had 3 strong hire interviews and 2 hires (not sure if weak hire is the correct term). I guess that the hiring manager for the team that selected me wrote a recommendation letter for me also. The recruiter said that everyone wanted to hire me at HC except for 1 person and that someone higher up opted to send me to another HC for a do over instead of having me go through additional interviews. Has anyone ever heard of anything like this? I'm sure it's not the case, but I'm jokingly hoping that they're already set to send me an offer and that this is a trick to make me more susceptible to accepting whatever offer they send me without negotiating :). Also, for background, I have 4.5 YOE and a M.S. in C.S. with a specialization in Machine Learning from a top 10 C.S. school. B.S. was in C.S. also.
Update: I found out that the 1 hold out on my first hiring committee didn't have a problem with my performance. They thought that my interview questions weren't hard enough :). That's why they were asking for more interviews. I feel better about it now and a little disappointed at the same time. I'll find out tomorrow from the second HC what the verdict is. Hopefully it means I'm at least looking at an offer or more interviews instead of an immediate rejection.