All of the reports said that a 38 year old man gave a statement about Gray thrashing around in the van. Obviously, Donta Allen is not 38 yrs. old, but 22 years old.
So, either (a) the reports made a mistake about the first witness's age, OR, (b) there was a mystery third passenger in the van, and not even the officers driving the van knew about him.
I don't know about you, but I'm gonna go with (a) on that one.