Their "expert" is just some guy who comes evaluate the cost of the damage. Not a expert on motion & collision who can tell who hit who...
Your best bet is to get a friend who doesnt look related to you (ie a asian middle aged woman if you're a white teen or something like that) to say they're a witness. Makeup a story how you got in touch w/ her etc... I dont recommend it just because its so risky but if you got $2k worth of damage there you know...
Hard to say. Basically you're screwed if you play it honest tho