I had this situation at a former Airline I worked for. Knew one of the recruited pilots was a total ***** but that was not up to me to point out and would have certainly reflected badly on me
Besides I knew it would not take him long
to show his true colours, which, predictably he did within days (we were still in groundschool when he started to show his prickly character!)
Within a few months he was physically escorted off the property.
He was highly suited as a single pilot operator!
As they say in the entertainment business, 'he had a face for radio'