Ollie lost connections with the New England prep schools.
In 2014 Hamilton was a great recruit, but the drop off after Hamilton was a sign of issues (Cassel and Lubin), with none of the recruits from NE/NYC. After Adams and Enoch in 2015, the 2016 commits were Durham (Florida) Gilbert (Georgia), Jackson (Cali) and lower rated Mamadou and Vital from New England preps. This was a great class (8th nationally) not because of local recruits. Injuries to Gilbert and Mamadou, Durham's recovery from ACL, Enoch's age and inexperience made Vital the only real contributor.
An argument can be made that the start of Ollie's downfall was the Gilbert and Durham injuries, and the lack of interest in the AAC schedule. Post 2016, Ollie had no traction with NE preps. It is unclear whether he pissed off the prep coaches or whether the coaches sensed or saw what was occurring and pushed their kids elsewhere. The 2017 class (Polley, Williams, Carlton and Whaley) was 84 in the nation and nothing from NE/NYC. The Jackson/Durham/Hamilton/Enoch departures are for another discussion
With Hurley's 1st real class Uconn gets 4 guys from Northeast prep schools and a transfer that was from a NJ prep. How much in BE related is not quantifiable, but I suspect there is a huge benefit that Hurley is reaping.