In retrospect easier to see where Groce went wrong. Start at his asst. coaches, they were neither great at teaching fundamental and developing players. They were also below average recruiters, they couldn't recruit at Illinois a historical top 15-20 program. Walker eas their top technical coach and recruiter, he was by far the wrakest one on BU's staff.
Groce's team lacked an identity on offense and defense. How many times did we see Malcolm Hill dribble while 4 guys stood around. With no identity/system he struggled to recruit the right guys, typically overloading on wings who couldn't dribble or shoot.
His teams often got blown out and played their best ball when Groce was on the hot seat. That was also when Groce seemed to rely less on his coaches.
Also tenure was impacted due to player discipline issues.