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There are multiple mobs that have been aglomerated into one by using busses and low bed trailers.
All are traveling by those means presently. They have traveled roughly 1000 miles.
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There is no agreement that this has happened from the news sources I have seen. The mob was averaging 22 miles/day for the first 9 days and I doubt that the speed has increased enough to go another 800 miles. The last news was that it was not going to be allowed to go to Mexico City so it was still in Oxaca as of yesterday.
If you have any evidence to support your assertion I would like to see it. Trying to get real information about this is very difficult.