When the HC is Rod Marinelli, you can bet that Martz will have almost exclusive say on the offense.
That's an assumption. In any situation it is going to depend on how much control or identify the HC is going to want to allow the OC to have or where the HC's strong suits reside. It also depends on how the HC manages his coaching staff or the expectations he has set. Lastly, there is the matter of trust. Does the HC have unquestioned faith in his staff's judgment and abilities or does he not? It is team by team and case by case.
As a Lions fan, I think people might be in for a shock this season. Martz, opinion, will not be operating like Rams North in Detroit and was probably told to check his ego at the door. Hey, I am excited with the hire but I do not think we'll see the Mad Scientist in Motown. His act is going to be toned down.
First, the Lions do not have the player personnel on offense. Second, the team actually has talent on the other side of the ball and just hired a defense first and foremost HC. Opponents are not going to get the ball any more than they should. Martz's offense, as it was, does not necessarily coincide with that idea.
Incompletions or substantially more passing v. running kill clock; create more possessions for the other team and put your defense on the field too often over a game. I do not see Marinelli turning Martz loose with a playbook for those reasons. Oh, he'll let Martz build and implement the offense but I do not see Marinelli taking the same
you do your thing, I'll do mine approach Spurrier took with Marvin Lewis.
My impression is that Marinelli, given his personality and what he is trying to get accomplished, is going to give Martz just enough responsibility but will not hesitate to veto decisions. That team will be built and play to Marinelli's strengths, which is defense, and the offense will fall in line accordingly.
Thus, I do not see Marinelli being good with Martz passing early and often; calling BS trick plays from the opponents 2 yard line or not taking what the defense is giving and forcing the issue. I am of the opinion that the Lions will be much more conservative than expected.