I do agree with you about the slow kids VS the quick kids. There is no doubt that the game has changed; however, when you have had smaller lines for the last few years, it is exciting to have some size. I am not concerned with not being quick. Most have started the last few years doubt they have lost much quickness.
I am not certain but I would say that there would be no linemen going both way. Some may sub in here or there, but not constant going both ways. But, then again, things do change.