Minutes played that week then you train GS doesn´t matter.
example: player with respectable GS play 100 min train GS and still may have strong or proficient GS
In short, this is not true. Game shape training improves game shape, but if you kill your players play every single minute of every single game, they're still likely to lose game shape overall.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."