Guys,
People use terms like sharp money and I am not sure you really understand how this is wagered and when. Typically opening lines were bet by sharps with an angle on the # if the line seems off. They will take that free money. Later on (hours before game time) if they feel like an angle can be exploited on the game itself they will make a sizable wager that could change the betting line to the public.
Like Billy W did on the FIU/AKRON game Sat. went from 20 to 17 in a minute after he wagered akron, GUESS what akron covered :)
Now a MNF game that has been talked about for almost a week is getting tons of press and detroit is hot so the PUBLIC money can be coming in and VEGAS trying to balance the # on the bears.
My take