One last thought, key numbers are important as some moves, like in football, can be a lot more significant than other moves.
A -7.5 move to -9.5 in NFL, while 2 full points, isn't as significant as a -2.5 move to -3.5 or even -4, a 1 or 1.5 point move, because of the key numbers getting captured in the move.
Most bettors understand this, but many still do not.