Please clarify what (college) "bubble" are you talking about?
There are so many levels of college baseball (even within D1, D2, D3) which is what makes all this recruiting experience interesting and maddening all at the same time. Identifying the bubble may help the board get the answer to you question. The schools you've listed are in significantly different conferences with regard to RPI and talent. There are 32 Division 1 conferences. You've got two at the top, one in the middle and one at the bottom of conference RPI which (admittedly) is a rough and crude way to establish talent levels.
Northeastern finisthed 3rd in the 14th ranked Conference RPI
Quinnipiac finished 3rd in the 27th ranked conference RPI
Unv of TX finished 5th in the 5th ranked conference RPI
Wake Forest finshed 11th in the 2nd ranked conference RPI
As your relative goes through the process, he should begin to get a feel for who is seriously interested in him, and who is taking a "flyer" on him. There is a college baseball talent hierarchy and he needs to become more familiar with it. If Wake Forest or Univ of Texas offered him, it is reasonable to assume that other offers should be coming in. However if Quninipiac offered, he'll probably not get further interest from TX or Wake Forest if they've seen him at their camp and he's done all the necessary communication.
What I would do is try to check on the interest of the schools in the same conference where your relative got the offer. He's established interest at that talent level and it makes sense that others within the same conference may have a need. Just a thought. As always, just my opinion.
Good luck!