I think the moment Kolles cancelled the contract with Dallara the wheels came off the HRT project. Granted the car may not have been fully up to F1 standards but the project had been compromised by Campos' inability to maintain the payment schedules.
Was it all down to Kolles?
I think Willis was the most critical of Dallara . . . then again, he was hired for quality control and technical direction.
I seem to remember reading that the Carabante family had (some of) its financial assets frozen in some way, not long after the purchase. I think Kolles (and Geoff Willis at the time) were led to believe that there were funds for the deal with Toyota which never happened. There was even a press release that it was a firm deal and Toyota staffed up accordingly. Then the owners couldn't or wouldn't pay.
Campos/HRT has had three owners, none of which really had the money nor the stomach for F1. That has been HRT's curse.