I have seen you say Jay Gruden's offense is QB friendly. What about his offense makes it so? What is he doing differently than other HCs or OCs to make his offense easier? If his offense is friendly or easier why aren't more coaches doing that? If it is QB friendly why wasn't it friendly to Griffin?
I will concede that you need players that "fit" your system before going on, however, I'll have a bit more on this later.
It's friendly by design, a design that's probably the best in the NFL, and has been nearly perfected when both McVay and Shanahan worked with him. For the QB is basically (timing) back foot hits, ball out. Studying his offensive scheme and you'll find that by design there is little for the QB to "read." (something that other HC's and OC's don't often do) His primary job is to do so quickly but see the throw before letting it go, which BTW is Kirk's biggest improvement since being named starter. (turnovers down, sacks are up, there are good sacks you know)
Well, add to that our coaching MVP (Callahan) this year and the blocking schemes associated with Gruden's offense and you understand why almost any QB would love to work in it although it takes a certain TYPE of QB to make it work. For receivers, it's execution and precise routes within some highly imaginative variations in his route tree. Although it does help to hold onto the ball an especially true statement considering the lack of a running game, which when going makes his play action lethal. You know this!!