Very interesting around and around scenario you...
paint. I know you probably don't realize it, but what you have so far laid out is that...nobody...has any responsibility for verifying anything but the T/A. That unfortunately for your arguement is just not the case I'm afraid.
Anyways...let me interject this and please respond. The elctronic transfer from the T/A to the DTC is, as you point out, customary. If the DTC were to find themselves in need of the actual certs they had previously accepted; what/how would they do?
TIA
"And the sharks started to circle... the smell of blood in the water was overwhelming!"