If it does, then the locals affected by Willa will be even less disposed to welcome the thieving penniless hordes into their area. Mehican government will face a quandry, whom do they protect and assist first?
Willa is only going to have a significant impact along the Pacific coast. The caravan is going nowhere near there.
‘If’ is really not a factor. We should not count on a East Pacific hurricane to resolve this.