Well there you go.
Week 2
Quick RT
Gold in running - power 720 xp
focus player - 200 XP
2x dynamic goal - 40xp
83 downs played - 43 xp
3 passing TDs - 9xp
1 rushing TD - 3xp
weekly goal 225 passing yards - 231 xp
Total: 1244 xp
Superstar LT got 1120 XP from running power gameplan alone. That LT is Ronnie Stanley. He does not have superstar development in the base roster. After year one I had enough XP to buy him that development speed. And he still had enough xp to increase him to a 87 overall.
My normal development center typically gets about ~600 xp a week.
If you want to improve your line you have to make it a point to improve your line guys, you cannot just hope they improve on their own. In all of year 1 two of my focus guys were linemen. I consistently work on my running game in training.