That was a tough question nik.
I 'll give a try.
In post 42, @Hunter answered correct that a player needs 300% skills to raise q one star.
One star is 5 quality points. 25-30-35...240-245-250.
So 300% skills from training are giving 5 quality points (q.p.)
So 1% skill gives 0,016 q.p.
But I think we have to multiplay that X3 because there are 3 categories (Def.-Att.-PM) , so it's 0,5 qp.
But if Stam didn't earn a skill pont in this last training, then he couldn't get more than a 0,5 qp and shouldn't increase his quality for the next star.
Don't know