Thank you for your kind words
Yeah, Gabelmann had ST 4 at the time which isn't great. On a NT level, stamina is very important if the tactics are set to 'Strictly Follow Depth Chart'.
But I never use that option with the NT, and instead use “Let Coach Decide”, which allows players to use their skills to the fullest even if they have low stamina. When using 'Let Coach Decide', it's possible to leave 2 positions empty, and then the coach will substitute players more frequently in those positions and keep them fresh. Here's an example of how that sometimes looks like with my own team:
The trick is to understand which skills the coach values the most for each position, and then set a roster in a way that the coach ends up rotating the players just the way you want it.
It's usually better to have players with higher ST on those 3 positions in the starting line-up, and than let the coach rotate the players with low ST on positions that are left empty.