We have already done the culture fit interviews. We only extend the opportunity to work on the project to people we want to hire if their technical skills meet

We have already done the culture fit interviews. We only extend the opportunity to work on the project to people we want to hire if their technical skills meet our expectations. If that isn't clear to a candidate when they are offered the project, or if they still are reluctant, then they aren't a good fit for us anyways.