I see what u mean, not easy to explain really to say it easy and claer.
But, the drill itself is a " all" , every skill trained, uses the same/wastes the same condition to gain progress... then all the skills win (after use condition) XP gaining -internally in a bar- and when the attributes, contained in the drill, that the player have reach 99, = 1% +
so, if;
-you train gk drill in a st, you dont win cause there's nothing to win
-using mixed drills the "main condition usage" associated is the same for all skills trained, but the GK ones, will win 0.
So mixed skills in non GKs is like, same condition usage of base... but really theres nothing to discount, because,
some drills train 3, 4,5 attributes, and the condition usage is... the same for all attributes trained "which" gain in a different speed (cause white attributes, train x2, so need the 50% of condition)..
I really don't know if explain xD but I know what u say...
U waste it basically, but, as when you train the Gk drill with a st, and you use the condition without gain anything -cause there's nothing to gain- here is the same, is like if the skill don't exist...
and I will point another thing, and is that, "there is nothing to discount" because there are drillstraining more, or less skills, but the relation of condition used / progress won per individual skill progress XP hidden bar, is the same for every skill.
More or less thats what I wanna say. xD