Can you say what makes you confident? It sounds to me (and we can see it in the video posted here) that there were 4 men (including the cameraman) and 2 women who were still on the car after they reached the platform.
The man filming got off the car and tried to film through the window while the car was being cleared.
Then, there seem to be three different types of witnesses who were on the car at the beginning. One group are the strap hangers who had to squeeze Neely into their midst; There's the one 66 year old woman (also a strap hanger according to NYP) who says she was frightened (but doesn't mention that she communicated this fear to Penny).
Johnny Grima came from another car during the event and he's the one who thought Neely was in distress, so he tried to pour water on him in hope of reviving him, was told not to by Penny. Grima says he feels terrible that he then walked away. Doesn't sound like he was scared of Neely.
A man named Kings has spoken out, but did not arrive on scene at the beginning.
And the man with the video, who was on the car at the beginning (possibly seated, IIRC). So there are late arrival witnesses, strap hanger witnesses and other witnesses on the car. The car, according to all accounts, was crowded when the choke hold began. People got off pretty quickly at the next stop, naturally.
"Several" witnesses (unnamed, this is according to Prosecutors) heard Neely say he was hungry and thirsty, that he didn't care if he died, that he would take a bullet or go to jail. Are these the witnesses to whom you're referring? They're mentioned in the article below, I think.
The article also mentions the GF#me group who is raising funds for Penny's defense; it is the same group who raised funds for Rittenhouse, according to NPR.
IMO. I don't think we've heard directly from very many witnesses, is my point.