If your culture breaks because you hire a mercenary, it sounds like a shitty culture to me. Other employees will be more engaged than others, and it is a good i

If your culture breaks because you hire a mercenary, it sounds like a shitty culture to me. Other employees will be more engaged than others, and it is a good idea to accept that from the start. In my opinion it is good to have diverse people. Part-time people have more time-management costs and hassle, so it should be otherwise better price/quality ratio. However "lacking passion" is not a good reason to reject a candinate IMO. You should hire to get the job done.