JAARule
"...but not my job to teach them.."
Interesting statement. Maybe not your job to teach them but ever thought of it as simple feedback? Is that not how we all learned as F/O's, from words of wisdom and advice from more experienced captains. Some advice was good, some was crap and some we thought at the time was crap turned out to be good. We picked and chose what we thought was worthwhile, often based on the merits and ability of the guy dispensing the feedback.
Don't do it for the sake of the Company, do it for helping your fellow colleague. If he doesn't want to take it onboard, that's his problem. He may thank you for it when he's on the command course!
Harry