Looking at that list, many weren't playing for their team consistently enough at the same time...they werent selected and certainly didn't all play together at once. If you look at those guys, many of them were the ones that got to euro 2nd round. Dzsudzsak, kadar, Stieber, juhasz, kiraly, szalai. If you put stieber, have to include Nemeth who had a very good beginning in Greece. They won the group and looked good in the group stage..even if the Portugal game was a scrimmage type, we should have beaten Iceland..dominated the game and if we won, we'd be group winners before the Portugal game anyways.
Koeman's first qualifier was against Denmark at home I believe. He tried using all the top players by putting Huszti as striker (Dzsudzsak replaced him already at wing). Huszti messed up on a breakaway and we drew 0-0. Don't recall whether he kept this idea of having the best players play even if its at another position, but it would have been a good idea.
Right now you can say that our attackers will be as successful if not more than that list. Daniel Salloi (if he chooses to leave US) and Roland Sallai will be top league players. Szalai and Nemeth are still playing. Dzsudzsak is still playing. In 10 years, you can say we had these 5 guys to pick from. Midfield Szoboszlai , Nagy. Goalie Gulacsi. Defense Kadar, Orban (maybe), Otigba (played in Holland so if you put guys that play in Poland, have to include Holland), Bese. Point is we are more talented than Finland or Greece and in 10 years you can say, we should have done more.