Not sure why you have such a problem with the concept of learning something on a command course. Is this such a foreign concept? A command candidate should turn up knowing the books backwards, knowing the sops and all the possible variations and interpretations of evey in and out... This is a basic prerequisite. Polish? I hope we are talking about the same thing.
Yes, I think people have turned up to command training with poor skills, crap attitude, health problems, troubles at home, runny noses, no idea of the books, and every other possible human combination. However, they are the exception, not the rule.
10 years in the right hand seat and the back seat doesnt necessarily make you a switched on operator, infact that long in the golden chair can do quite the opposite. You honestly dont know any bone lazy SOs or FOs? Are all the guys you fly with Jedi Knights who couldnt possibly learn another thing or make a mistake? You know as well as I do, some people just do enough work to scrape through, anything extra is a waste of pi$$ drinking time.
Think of it like this... You turn up to a bbq with a brand new Ferrari, you just bought it. All your mates want a drive. Some, you wouldnt even let them in it, you know they are going to cane it as soon as they are around the corner. Some you think will be ok, you just want to ride around the block with them to make sure, some of your mates think they will be fine because they used to have an rs2000 escort back in Australia, and some probably are going to drive it better than you, because they already have ferraris.
Whats wrong with the company designating someone to "Screen their mates" with their new 777s?