I think you guys are getting some things mixed up. There is only a penalty for 'passing-over' if the leader you are promoting has a lower seniority than another leader of the same rank.
In the example, BD66 posted Meade and Doubleday may be promoted. Apparently Doubleday has a lower seniority than Meade, because the game warns that if you promote him over Meade, there will be a penalty. BD66 reported nothing about a warning for Meade.
Does this mean that if BD66 promotes both at the same time, there will be no penalty? No, if there is a leader between Meade and Doubleday in seniority, there my be a penalty for promoting Doubleday over this leader (the game does not take into account that Meade is being promoted and look for the next leader below Meade. You would have to do that manually.
Is it absolutely certain, that promoting Meade and Doubleday at the same time, that there will be no penalty? I would say no, but probably not. If the game doesn't promote from the highest rank-n-seniority to the lowest, there would be a chance of coincidentally promoting Doubleday first and then Meade, which could trigger a penalty for promoting Doubleday over Meade, even if it were for only the fraction of a second.
Am I sure of how the game does it? No. BD66 try it out and we'll know at least in this case what happens.
BTW if there is somebody between Meade and Doubleday the messages will tell you who triggered the penalty, even if you don't seen them now.