My understanding is that the scouts give their information to Ciskowski, not Marinelli. After that, Ciskowski and the scouts put the board together. Marinelli has very little, to no say, in the construction of the board.
On draft day, Will McClay and Ciskowski will be the loudest voices in Jerry's ear, followed by Garrett, Marinelli and then the rest of the guys that are in the war room but Jerry ultimately says yes or no to every pick.
Marinelli will have a say, but he's far from the only voice that matters.
I think you're missing my point.
1. Everybody in the Cowboys organization will have access to all of the player information that is gathered by the scouting dept.
2. They won't use a 1st on a player the scouting dept. has graded as a 7th just because Marinelli likes him; however, at each pick they will have it narrowed down to a small group of players for that pick. If one of the players is a DL, then Jerry is going to consult with Marinelli on that player. If Marinelli loves the player, then Jerry is likely to pick that player. Remember that Jerry is only consulting with Marinelli because all of the players in the small group are basically on the same tier according to the scouts. If there is not a DL in the small group, then Jerry won't be consulting with Marinelli at that pick. They will either draft another position or make a trade.
3. There are conflicting reports on who is putting together the board. The reporters closest to the situation insist that McClay will be in charge of the board. Jerry did make a rambling statement in an interview when asked about topic that seemed to indicate that Ciskowski was in charge; however, any comments made by Jerry outside of a press conference type setting are often inaccurate or misconstrued.
4. Jerry overruled the scouts and the board last year based on input from Marinelli. Since that time Marinelli has been promoted to D-Coordinator and likely has even more pull with Jerry than he did a year ago. This is especially true with DL being the top need this year.