I also think it's good we're playing backups. Sure, you want to be battle-tested on starters, but this is football, not a one-on-one game like (usually) baseball. The O needs to be learn how to execute at game speed without having to worry about getting crushed. Sure, they have to learn how to avoid getting crushed, but if they can't execute the play to begin with at any speed in a game, then there's no point.