1st time playing roster only.
EXAMPLE:
So, if I have a certain player who is say a LT (also listed as a LT) playing LG1, will he be the starter at LG1 ?
Can players be at multiple positions and get reps at said positions?

I'm pretty sure it will start them at the position they are listed 1st. Then if they get subbed out due to fatigue they might be sub in at another spot. Or they will be too tired to play. Honestly not 100% sure.