@ Tactician I will explain how I play the game.
Starting from the fundamentals :
I want to avoid the +1 LV opponents in Cup and CL/SL and the tankers in my League too.
So the last day of the season, I ensure to finish with a team with less than 90-100% quality (of the best 14 players).
So I keep 8-9 high quality players + some low quality to drop the avg.
My high quality players start the new season from about 100% q and finish the season with about 120% quality.
For players like those, 75 greens per season are enough, so we can get for free this amount of greens (and more) if we are consistent managers.
I keep those players for about 6-7 seasons.
A player, ft, has two periods.
First period where he achieves the max training is 18-21. The next is from 22 to 23-24. Above that I don't keep players except in a case of a super scorer when we go to create some scoring records and legendary players.
So when my player becomes 23-24 y.o. I sell him and buy a younger one for the next seasons to replace him.
Usually I add an extra position and sa but we consider the extra amount of greens for that, divided with the seasons we use our player.
6-7 seasons make better the investment.
I 'm trying to have at least one header and D.wall in defense and a f-k specialist for attack (so trying to have 2 players with those sa).

Examples from my team this season :
Time to say goodbye to NESTA.
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I replaced NESTA with MALDINI (more details here #897 https://forum.topeleven.com/tutorial...ainers-90.html )
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After adding two positions at MALDINI (using attacking drills) , I started some power training with defending drills.
For example 4XPress the play + Use your head + Defending crosses , also some M&P drills for white skills.
When his defending/white skills reach +130 %, I stop the power training and let him earning the rest from games participation.
For the next 2-3 seasons I do the same at the beginning of the season.
After those seasons, my player has high defending white skills and at the age of 22 he 's loosing some gaining ability (about -20,25% from previous period).
So at that point, I 'm starting the power training at his grey attacking low skills.
So this season, I started power training for NESTA with drills that have his low white skills (Dribbling, Shooting, Finishing and some low white like Strength or Creativity).
With those drills NESTA could earn +4% skills even if he was "old" . So increased his general quality and finish another one season with a 115% quality.
The same I will do with MALDINI. to keep him for the next 6-7 seasons.
General quality matters for sure in game calculations but we don't know if the high white skills matter as the old days.
From my personal experience, a player (attacker or defender) with 150% white skills is capable enough.
No need to go for a balance of 200%-20%.

The same with attackers.
Last season for IBRAHIMOVIC (a short version of this great player - 1.69 height )
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replaced from INZAGHI.
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A problem can be with midfield players like RIVALDO.
He hasn't low % skills so to use the relative drills and get some good training.
In that case, I will spend more than the attackers and defenders to keep him from 100% to 120% for the next 3 seasons.
But it's worthy. It's a great coaching tool.
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So yes, white skills gain more than greys but only in the beginning (also players earn white skills from the games and the motm title).
But later it's more worthy to invest at low % greys.