How to know the "absolute value" of a player?

[Ragtime]

Hi managers!

I've started playing the game recently and I'm not sure to understand how it works (I may be a bit simple-minded but I need to understand things -at least a little- to enjoy them).

For example, stars => if I understand well, players stars depend on the leagues your team is playing in? (and when you're promoted, some of your players may lose a star, because they're not as good as they were in the previous league... right?)

But what make a player better than another since all of them have the attributes in %? (and not absolute values)

More concretely, what makes this player

Player 1
Recruited in League 2
Speed 50%
Dribbling 50%
etc.

better than this player?

Player 2
Recruited in League 50
Speed 50%
Dribbling 50%
etc.

Is there a way to know the "absolute value" of a player?

What would happen if a team of Players 1 played against a team of Players 2? Would this be a balanced match or a one-sided victory?

That's a bit disturbing not to have a clear vision of how good a player is, like in FIFA or other classical football games (ex : C. Ronaldo 97, Messi 96, Ozil 89, Benzema 88 Pewpew 55 etc. at least I understand that Ronaldo is way better than Pewpew)

Did i miss something?

Anyway thanks for reading! hope someone will help me figure this out