If you want your SS to be able to start every week, he needs to be able to play the run and the pass.
If you have a higher strength, you don't have to set your tackling focus to wrap up. High strength you can go for the big hits and cause fumbles, without fear of a missed tackle going for 6.
If you have a higher strength, you don't have to set your tackling focus to wrap up. High strength you can go for the big hits and cause fumbles, without fear of a missed tackle going for 6.