Player Locking onto a DE is a very effective strategy to use this year. Cuz with the new block shedding moves, you can actually tell your DE whether to go inside or outside depending on where less blockers are. With player lock, you get that camera angle that shows you where the best place to break off the block is.
ALso containing and using player lock works cuz your guy gets outside without being blocked yet, and once you start to rush inside the OL will try to block you, sometimes he does, sometimes he doesn't, but it's a good way to get an outside rush without looping the Dline.