When my son was a senior an agent from a big firm advised him to go to college first. Projected to be a 6-10 round pick, with a strong college commitment, an offer from the NY Y (150K signing bonus) he went undrafted and headed to college, three years later he was drafted in the second round, and to this day still has the same agent that advised him in HS.
BTW he was at one time ranked between 50-75 nationally in HS, but that did change as one gets closer to the draft.
The player needs to work hard on and off of the field and be open to all options if presented. If he trusts this guy, listen to what he has to say, it may be that he is not looking to do anything but advise your son if needed when a choice arises.
That's all you can do at this point.
Thanks for providing better info.