If you need a 2nd coach for the team I'm free
The thing is, despite the stars level, the player have internal %'s of effectiveness, and this game is made to make you work and coach, not to buy a team full of 6* and recive a automatic victory per match.
Is worth a player Scout level? depend, I've bought many... near 40 maybe? in all my career and there are 3 types,,,,
the Key players, that can win the 70% of a title they alone, these who score and appear in every match or the 95%.. and that... usually I found 1 player like this per season,, and is a ST or MC,,
Then the acceptable players, that, or assist/sscore 1 time x2 matches been ST/MC and too if we count the defenders, help, and, sometimes too, been MCs help in defense during matches more than some DC..
And the player type Djibril Cissé that I had last year or so.... ST, 26 matches, 3 goals.
Worth or not, depend of what you see after test the player. And tests include, test a player for corners and for fouls, that is something that can help a lot, for example my best scorer 2 seasons ago was the MC Pavel Nedved, that scored many goals from foul.
Then, as all teams have better and worst players, in internal quality terms, the only things you can do to create advantadge in anticipation terms, is to train the phisical stats, because the effectiveness in % of goals scored per shoot, is more a thing with a limit style min./max. internally proggrammed, that can be slighly increased maybe adding cones in shooting and so, but the impact is higher adding your cones with the idea to increase the speed. Thats how I deleted 9* teams in Cup.
Good luck.