That sounds realistic given what we know so far. The missing pieces of information are:
* why in hell would any competent system designer specify and build such a complex accounting system with so many expected transaction checks omitted and who did this?
* why Horizon was apparently programmed and put into live operation without any System Specification and Acceptance Test being written and without any record of acceptance testing being completed and kept as part of the expected system documentation set and who accepted it for live operation, apparently without any acceptance testing? No record of this work has been mentioned so far
* Who accepted the ';completed' system and OKed it for live operation?
None of these points seems to have been mentioned so far in the HORIZON INQUIRY, and I'm left wondering why.
Consequently, it is stating to look as though nobody involved in the HORIZON INQUIRY has the required competence to design and implement complex financial computer systems of this size and complexity. As a result they are simply not capable of recognizing the sort of massive incompetence in designing, implementing. and debugging large-scale financial computer systems that those who designed, implementer and certified HORIZON have displayed and are continuing to exhibit.