There is no way to shoe-horn Mr Jennings making two trips to the OEM, finding it empty, making a few calls, leaving down to the 6th floor then back up to the 8th before the buildings collapse (atleast not before the South Tower). They would have to be sprinting the whole time.
There are so many failures in the timeline that MM us pushing it takes a real religious idealogue to maintain belief in it.
Yes, J&H have to be sprinting from place to place, then they have to survive a close encounter with an explosion with nary a scratch, then they experience two more horrific enveloping dust clouds and a building reacting to having several exterior columns being violently ripped out, all without any more comment other than having "heard" more explosions.
In addition Jennings' saying they arrived before WTC2 was hit is patently in error, a situation which even MM, after arguing the point for a while, now acknowledges. The time at which they made their final exit of the OEM is also quite obviously much later than MM can accept yet he continues to maintain his belief, religiously.
Lately he switches gears to Zarillo/Drury and the expectation that Zarrilo and Drury could be exceeding the speed limit. My experience in a much smaller city, Winnipeg, when the Jets are at home puts the lie to that. It means a large influx of cars to downtown, a large number of people walking from parking lots and restaurants, to the MTS Center. Streets are almost choked and although traffic moves along there's no weaving through it at any speed let alone greater than the posted 50 kph.
Now in a similar rush traffic situation, add in fear, as opposed to getting to the game before the puck drops. Then add in a large number of emergency vehicles doing two things to traffic. First of all they simply add to vehicles moving on roads leading to the area, and second, once there they park and clog some streets.
Something like 20,000 to 50,000 people were exiting the area of lower Manhattan after the second crash, and doing so by surface vehicle ( trains had shut down) and on foot. This is unlike regular rush hour in which this exodus is orderly and not the result of fear and benefits by a good percentage taking the trains. Its also a double rush hour in that surface vehicles are still moving in the normal pattern into Manhattan at the same time as this exodus from Manhattan is occurring.
But MM, expects vehicles to see Drury's flashing lights and move to the right and allow him to pass. Not bleeding likely, even if they want to its quite probable that much of the time there's no where to move aside to in order to let him pass.