Let me continue to draw the distinction between a "coach" vs. recruiter.
Souza has no notable recruiting success. The kind words about Souza seem to be his ability to coach and connect with current players. His interview suggests the same. By nature, we cannot judge how good a "coach" he is based on his track record.
By comparison, Leaman had four years as an assistant at Harvard when Union hired him. Greg Carvel had one year at SLU before he got the top job. Not tremendous track records with the prior teams, but they show this model can work.
There are examples of good recruiters for top programs, who benefit from the ability to leverage reputation, but are not successes. For example, Seth Appert had many years at Denver, mostly making name as recruiter. BC has sent Paluch to Bowling Green, Mike Cavanaugh to UConn.
Veteran solid assistants who earned stripes coaching (contrasted with recruiting). Lowell, Norm Bazin, Yale - Keith Allain, Red Gendron, Maine, Michelleto at U.Mass
I may be that we just have to wait for him to hire a competent recruiter. Every top coach needs someone to buy the groceries. If that's not Souza's skill set, he needs to hire an assistant with that skill ASAP.