I agree for the most part. The Richmond game probably isn't the one to point to when referring to lack of defense from Fran's teams.
However, when a narrative is born and then lives for a while in a program, it is natural for fans to get to a point where a line has been passed. It's a results based game and culture. That Iowa team finally played to its' potential in the Big 10 Tourney and won it all. Fans were ready for a bit of a run ... and it was gone in one game.
The let down is natural, especially for the fans. You are ready to finally buy in ... and Lucy pulls the football again. I understand how and why some fans will point to this as the point of no return.
The point of 'defense travels' is that (similar to football), it seems like you are always within reach in a game if you feel like the team can get some stops. With many games during Fran's tenure, you could feel the team was one stop away from getting over the hump, but the stop never came.
The Richmond game was a great example (According to ESPN Play by Play) - Iowa is down 8 (54-46) with 6:13 to play, and they continue to battle. They cut the lead to 2 with 2:58 left, then give up a layup. They score 3 in a row to cut the lead to 1, then give up a layup again. Kris Murray misses a 3 with a minute to go to tie the game, and another layup for Richmond to go up 5. Iowa never really got a stop - Richmond missed a FT with 1:24 left for Iowa to get an opportunity to tie the game.
One stop in there, and an Iowa basket and everything may change.
Ben's team will be a change of pace and we will see if the defense is up to the challenge.