I feel that if your player gets injured playing in one of your Diamond Dynasty games he is just not out for that game but a series of games. It doesn't have to be 15 or 60 games...They could make it between 1-10 games. So every Diamond Dynasty game you play would equal 1 game. It would also encourage more game play.
Say your best player gets hurt for 5 games. Your going to have to find a replacement and you would almost be encouraged to play more games in anticipation of the guy coming back. Which would really give a vital reason to look at the durability rating of your players.
This would also make you think twice about Diving with someone or stealing with someone that shouldn't be diving or stealing. During my years of playing ball i recall having teammates that weren't the most athletic but could mash at the plate. There would be times where the player would lay out or dive head first when it wasn't necessary and we would cringe and the coach would say. " hey listen big guy i appreciate the effort but i would rather have you in many games then you make that great play in a non important situation....we need you tomorrow "
-------Position Player Energy------
Pitchers have a change in energy so that you can't keep rolling out the same pitchers. Here's the thing position players get time off as well to rest in the MLB. Once again here is when durability comes in just like in franchise or season. The more you start the guy the more his energy is expended. How fast? Depends on his Durability.
We would see different lineups instead of everyone rolling out the same players. If you start a player with low energy your run the risk of your player getting hurt and going on the DL. It would cause to you to treat your valuable cards like real owners treat their valuable players. To be cautious with them. Also if you run a player out there with low energy he might not get hurt but he wouldn't perform as well. There could be an uninformed decrease in his stats for that game.
I know a lot of people do not agree but I just hate seeing the same players being used all the time and would bring a little more realism to managing your Diamond Dynasty Team.