Tigers were a 3.5 point favorite at home in 2012. Last line I checked for this Saturday is Tigers -3 or -2.5.
The info on the spread for Saturday still shows Watson as questionable. I don't know how much Watson would move the line even if Dabo said he will play simply because most of the country hasn't seen enough of Watson for him to make a difference in moving a line. So, regarding the spread, this year is almost identical to 2012 according to the oddsmakers.
In 2012, the Tigers lead at the half but that was a much better SCAR defense. If the Tigers are leading at halftime this Saturday, there is nothing in SC's season that indicates the SCAR defense will get them back in the game.