Ok i`ll try and give you guys some info even tough its only something i think about and nothing is for sure.
The shortlist is the best thing Vincent can give us.
I mean, why do you say it will take forever to select the players for your squad?
Of course, the manager of the NT Team needs to take a look at more skills not just for example Scoring(for strikers) because maybe one forward has 3.5 balls and 1.5 talent and there the manager finds another striker with 3.4 balls and talent 2.2, wich one would you choose? Of course you as a manager cant train him but thats why you are a manager. You should be able to talk with each managers of your players to ask and talk what will he train that player etc.
So a shortlist will be perfect and it will take no-time to choose your squad. As a active manager you will find it easy.
On the other hand, Ace said something about limits.
What if the top club from a first division has 6 of the best NT Team players? And when i say best i mean every skill, tactics etc. What would you do? Of course you will select them because the most important thing is to win with the NT Team every match/competition.
Even tough it was a pretty hard example, 6 NT Team players will never be in the same club in the next 4-5 seasons because of their salaries and everything. Right now, with a few credits you can create a NT Team player. That wont be possible in the future because other players that were created will be hardly trained and will be way better than the best player that a manager can create.
A long post but i hope it helps.