The first part was the whole creationism/ID argument. Anytime you hear someone say "evolutionist" it's a dead giveaway that they're a creationist. But I shouldn't even have stoked the flame bait, so that's the end of it you'll hear from me! :)
On topic of GS and DMI, like you said I have been tracking it pretty consistently for the past 2 seasons (though anyone who regularly uses buzzer-manager has been tracking it. If you click on your player where they show the week to week skills, they also track the GS and DMI from that week).
The only consistent things I've found are that DMI decreases 100 points every two weeks on untrained players. All my players are between 18 and 30, and salaries up to ~$7500, with stamina from 1 to 6. When I finally get a player to drop a second stamina level, I should be able to calculate the total contribution of a point of stamina to DMI (assuming it's all additive, at least when considering these types of players.
Other than that, in training mostly OD and PA, with some 1v1 this year, fully training of OD and PA increases DMI about 5000 on my guards, whereas 1v1 increased it about 3000. Again those exact values presuppose the actual skills of my guys, but these changes range from ODs from 7 to 10, PA from 5 to 8, and DR from about 2 to 7 or so.
It's harder to answer whether certain players prefer a certain number of minutes, or whether GS is affected by this week's and the previous week's minutes. I just don't have enough data to tease apart the random effects and the real effects.