It's not like our veteran team wouldn't get knocked out in the last 16 round either if we'll get a tough draw. At least that team would have some "excuses" due to their relative youth/inexperience and kids could learn something. They'll need to get through growing pains eventually to become better longterm.
I don't see Konrad as a LB though.
Yeah, he should learn from Messi how to place shots better. I don't expect him to ever be a prolific scorer but that's ok as this won't be his role in the team. Would still be nice if he could add goals to his repertoire to further improve as a player though. He has more than enough time for that but for now it's good for him to come into scoring chances even more so playing with other squad/backup players with whom he never played before.
Yup dragging Messi to that pain of knock out ? How about sell Messi now before put him in another humiliation while carrying youngsters