As it is now, the four most senior guys are flying the Citation and I don't see them hiring into that plane.
As far as the "single engine" deal on the Pilatus, as far as I know there were never any failures on either the PC-12's or the Caravan. They both use the PT-6 which is as reliable as a prop engine can get even though they do fail on occasion. I know of one incident (during the day) where a couple of guys made a precautionary landing because of an oil pressure issue. At night, in paticular, I'd fly higher and try to plan a route with a suitable landing area within gliding distance in case the one enigine did burp. Pilatus claimed the plane had a teriffic glide ratio and was very survivable in a forced landing. Fortunately I never had to test that claim.