@Robert *********
That is a good explanation for this. Thanks.
Its true I dont need an agent, I even have more than 500k in bank for over many months, 90-day report, etc etc, so I practically have no danger of being refused a re-entry, even if the officers were to scrutinize to the maximum extent under law. And I have no overstay stamps or anything like that. My inquiry with the agent was to simply avail fast forward / understand ground situation in case I miss some small details - such as the dollar bills for any VOA for border-bounce must be in mint condition, otherwise they refuse. etc etc. Also, had heard a few reports of entry refusals on Reddit, but none of them had DTV. And all my previous experiences with agents have been quite informative and insightful, except this one.