People are acting like who starts Friday is the be all and end all of who starts the whole season. That's simply not the case. This is preseason. It's the time to experiment with stuff you are not sure if it's going to work, like who your starting QB is when you have a QB battle raging. When you are having what you have termed a QB competition, the only fair way to do it is alternate starts. Moore had his shot last game, now it's T-Hill's turn. Starting Tannehill for a single preseason game is not going to scar him for life and ruin his career if he plays poorly. Tannehill might suck up the joint against a starting NFL defense, or he might tear it up. Better to know that than not.