[jaysdailydose]

I would just switch "base roles and positions" from Real Life Stats to AI Evaluation.

Then, the AI sees that the player doesn't have a defensive rating at the position and tries to make a better choice. I've seen some "bad" defensive choices early in my dynasty, but I see the CPU trying to correct them in fairly quick fashion. Example: AI had an aging Carney Lansford as its main 3B option, with a player without a defensive rating at 3B also getting some time. By May, the team had made an acquisition to bring in a solid defensive third baseman, and traded from an area of strength to bring in the replacement. This allowed them to move Lansford to his highest-rated position (first base) and moved the solid third baseman immediately into their starting lineup. Same from the other team, they traded from an area of strength to tighten up a weakness, for a player they can and immediately began using.

Sorry for the multiple posts, but I was posting on my phone and it was hard for me to get my whole thought out. I'm guessing you are trying to play a style that is fairly similar to how real life played out, but with some variation?