Monaco's one fluky quarterfinal is better than 5 round of 16s?! What?
Yes, making the final 8 is better than making the final 16 your ceiling.
Who? The only players that could even argue a place are Moutinho (worse than Cazorla and Ozil) their CM whose name starts with an A that I can't remember (closest one, he played well but I still don't think he would start) and their CBs (looked impressive when the ball was in the air, but on the ground Mertesacker and Koscielny are much better).
Kurzawa and Fabinho are one of the best young full back tandems in the world, both having already earned caps for the senior sides of their respective countries despite their age. Kurzawa is first choice for France, Fabinho is just breaking through for Brazil. Both of them are products of two of Europe's best youth development systems in Real Madrid and Monaco.
Kondogbia has been a French international since he was 15, winning the U20 WC in 2013 playing in the middle alongside Pogba. He's one of the highest valued young defensive mids in the world.
Same as Kondogbia, Yannick Ferreira Carrasco has been an international since he was 15, except he plays for Belgium. He's currently experiencing a breakout season on the club level and is seeing his value increase tremendously. Very few attacking mids/LW's of his age group will fetch more on the transfer market.
Martial is one of the highest valued strikers of his age group, if not the highest valued, being a legitimate wonder kid producing at the senior level. Same story with Benardo Silva of Portugal who came up through the Benfica youth system. Highly valued wonder kid killing it on the first team.
I could go on, but Monaco is stacked with young players of class whose value confirms their quality. Wisely, Monaco added established veterans such as Berbatov, Moutinho, and Falcao to help bring the younger guys along. They're no doubt better situated for the future than Arsenal, who'd have to shell out 100m+ to fill their youth system with comparable depth of talent.