You have a better running game, you have men stacking the box and more lanes to pass and freed up more. A better running game, means the defense has more to think about and watch for. A better run game allows tannehill to have a much better chance of utilizing play action and making a defense bite on it. A helps keep the pass rush off as they can get gashed up the gut with big run plays. When a team has a crappy run game, defenses have less to worry about so they can have more guys in coverage and at the same time, just blitz and tee off with their pass rush. It really makes it tough for the oline for pass protection, because the defense has to no fear so they are going to play the offense like their plays are going to be a pass. This gives the qb less time to pass, more guys in coverage. Simply, a qbs chance of performing well diminish the more one sided the offense is because it makes it so much easier for the opposing defense to play the offense. So a good run game takes the pressure off the qb more so, which in return, may not necessarily mean the qb will play well, but it gives the qb definitely a better chance to perform well or better than he would with no run game. Don't you want your qbs chance of performing well to be better?
If you've watched the amount of football we all have, and you've listened to the commentary involved, then of course you know all of that makes sense
in theory.
However, the plausibility of all that in theory doesn't mean that for a given quarterback it will play out
in reality. It doesn't mean that when that particular quarterback has a better running game, he will play better individually. It's also plausible that a more effective running game could have
no significant effect for a particular quarterback.
An example might bring this home to you (and others). Let's give Chad Henne a top-flight running game. Just how much of an improvement is that going to equal in his individual performance in the passing game?
In other words, every quarterback has a ceiling on his individual performance in the league. At this point we don't really know what Ryan Tannehill's ceiling is. It could be that he's already reached it, and that improvements to his surroundings would do nothing significant for him. Or it could be that significant improvements are in store for him, and that they're a function of improvements in his surroundings, or not.
However, when you look through the game-to-game statistics from 2013, and realize that when he
did have a better running game, he performed no better individually than when he
didn't, it isn't a promising sign.