It's interesting how this series handles loyalty and trust. Shigegi and Ritsu have both tried their best to do everything right and have even gone above and beyond what is expected, but because of a lack of experience or skills they are passed over for better offers/professionals.
I appreciate that the series doesn't make this out to be malicious or a betrayal. it's just a relatable feeling that people would rather be/work with people that are more stable and know what they're doing.