Coach Summitt's system was successful bc she was one of the best at motivating and getting the most out of her players. Holly tries to emulate it, but she doesnt motivate, and she doesnt discipline her players, and this is the result..
Just one correction, it is a very long time since TN played 'smart' defense. They typically play man, but the next TN player who provides timely weak side help will be the first in my memory which dates back to the backdoor lay-up drill Uconn ran in the Philly NC game.
I think both of you nailed it. Pat was pretty famous for not teaching much in the way of offense (hence, her famous "dalliance" with Peretta of 'Nova to learn some offensive schemes)...
But as Boxer said, she DEMANDED defensive excellence, intensity, effort, etc etc at all times. And if she did not get it from her team, they would face the consequences. By sheer force of will, she was able to get the max defensive effort from her teams.
Flash forward to Holly - she simply lacks the ability to be as intense (or use any other adjective) as Pat, therefore, with no new offense, no new teaching, she tries to employ Pat's techniques on offense/defense. Sadly for Tenn fans, Holly lacks Pat's... everything. They keep making coaching changes/additions (Law, Reaves, Gordon, etc), but none of them have any clue how to run/teach offense, and without Pat's ability to motivate, sheer talent will continue to lose out more often than it should...