HairBane stop speculating - it's like you're trying to get a rise from them ;)
When a company goes from 2A to 2B it generally means they are going to attempt to increase the dosage to get even better results.
Unfortunately for us this means Histogen needs to do more work. I've read cases where the drug company has to even go so far as to test these new dosages on animals again before humans.
I suspect in this case it's not money related but time and even more bullshit FDA processes getting in the way.