I've never heard of any rules regarding this particular system when the line moves. Usually if the team is favored by 3 or more, you don't have to worry about it switching the other way so we never really see it.
I believe its still a system play since Vegas installed Marquette as the favorite. Even though the public is on Wisconsin, you still gotta shake your head a little since the line move is so significant. We'll just have to see what happens.
Best of luck. . . the system plays haven't been doing well so you may be correct