John Jax wrote: Is it fine to play the same player in offense and defense, for the sake of saving money? Or will that negatively impact their game?

Only thing I was told, was that an OL playing DL, would be skilled points for Offense rather than DL..

One player trained up to 19 playing two positions is often better than two players trained up to 16, and cheaper too. Look at how the top teams are doing it. They aren't top teams for nothing.

There are two kinds of dual position training.

1) One player to cover two or more starting positions at once. Think OL/DL, WR/CB, QB/K, OL/STCB, CB/Gunner, LB/Gunner, QB/SF.

This kind of dual position training is very difficult. You need to find a player with starting 5-7 starting skills in multiple areas (blocking and tackling for OL/DL for example). The player will also need his teamwork to be as high as possible. 13/14 would be the absolute minimum and preferrably 17+ if possible.

2) One player to play a primary position and serve as a backup to another position on the same side of the ball. Think WR/TE, OL/FB, DE/OLB, OLB/CB, MLB/SF.

This kind of dual positioning is much easier and has multiple benefits. It helps build depth in case of injuries. However, it also helps a player gain Experience much faster. By the time a player has reach max BPOS at two positions they will be at or very near 5* in BPOS.