If Matey boy in the other seat has 200 hours and my company has released him (or her) to line flying, then they are fit to be there. They might not like flying the plane when Captain Grey croaks, they are in heavy icing conditions and the brewers go tech. etc... Who would? But they'll cope because they have to. That's why not everyone with a licence gets a job. Those who do the recruiting don't have sufficient confidence in some applicants.