I can't say for sure, but I would strongly imagine that they would want any managers they hire to be intimately familiar with the culture. So I could see that

I can't say for sure, but I would strongly imagine that they would want any managers they hire to be intimately familiar with the culture. So I could see that even if they did hire externally, the applicant would need to train through one or a few different jobs and become acclimated with their way of doing things. But I'm seriously only guessing from what I've seen of companies with really strong company cultures.