Being a head coach means at the end of the day, you are in charge of the whole thing. No doubt that schools with better facilities, better academic reputation, and in theory better history will have an easier time recruiting, all things seeing equal. But at the end of the day, if the wins aren't there, the recruiting starts getting harder. Jack Parker got a bump when Agganis was finally built. But when the wins started to fall off, even the having all the other qualifications (facilities, academics, history) couldn't stop the recruiting from falling significantly.
Yes, in theory a school like UML doesn't have the history or the academics that a school like BU has, but they have the facility, and more importantly, they found a coach who came up with a plan to still get wins - recruit older guys that may not be tops in their age group, but are solid players who buy into his system. Schools like NU and PC are sort of a blend in their approach - some older recruits, but lately, getting some to the USNDTP crown previously reserved for the BU/BCs of the world.