Good decision to increase the number of bid requests in responding to local construction industry. It proves the theory that if more companies compete then the final bid will be lower. Also that the HART estimate was correct.

One station to inspect is just an estimate. Nan could have put out nine designs in a very short time making all the stations very similar and started construction on all stations. HART would have still needed inspectors for the 9 stations. The auditor is wrong.

Note that change orders are low. Each builder has only one station design to optimize and is not worried about making the same changes over nine stations. This might show that more care has been given to each design by each builder so that the changes are minimal or no mistakes 9X. 

Given the greater number of inspectors, better engineering value can be done for each change. That means there's something to be gained that's more than something that is lost by each change. So we are improving the design.