Are the players with weak skills being asked to improve though? You would expect that the coaching team have identified areas for improvement and given those players the specific requirements - what needs to be improved, how it can be improved, when it will be improved by; and set up the skills coaching to do that. Then it comes down to the player putting in the work to improve. Some players will take it upon themselves to seek improvement and to find out where they are lacking, but if the coaches are quite okay with where the players are at then they are not being pushed to improve. You can understand when someone is playing out of position, but when they are in their best position as a professional athlete they should be able to demonstrate the skills required at that level - whether it is throwing into the lineout, scrummaging, passing on both sides etc.