Infected person becomes symptomatic on the trip, infects others, dies or is left behind. Figure that is the end of week 1.
Newly infected people keep up for up to two weeks, infecting the third wave, so to speak, as the group picks up members.
Those who sicken are left behind.
The newly infected continue on, the coyote picks up more people, lather rinse, repeat.
It isn't a question of whether the initial infected person makes it across, but whether the disease does. After all, their mission is to get the outbreak here, not the individual.
The subsequently infected individuals are the transfers and connecting flights for the virus. No plane needed.
I also question the timeline of 40+ days, when we had kids showing up at the border wholesale after taking the Beast through the country.
Certainly a terrorist organization would be able to do far better logistically, and get the first person or the second group into the country by having them join the group closer to the border.
They have Billions of dollars at their disposal, and that makes wheels turn faster than they will for the average peon.
Or, more likely, the coyote is infected, and the travel of the group stops right there. The infection burns itself out as most, if not all, of the group dies.
I have a hard time trying to come up with a believable scenario of how a potential illegal immigrant who has Ebola could survive the journey to this continent in the first place. I see news that air travel is restricted, so how else can they possibly come here within the 21 day window of incubation?