You guys should do a test: randomly have a team of 10 or so people re-interview, without disclosing to anyone that they already work there. I would bet a good amount of money that at least half of them would fail the interview loop or get thrown out in committees, easily 2/3rds at Staff level and above where committee is less accommodating. Record it. Publicize it internally. This will be the best "humility" training imaginable.