More than 4 teams are capable of winning the SB and the bookies odds show it.
The odds imply there is a 70% change that the lions, Eagles, Bills of Chiefs will win the SB but there is profit built into those numbers, (the odds imply there is about a 107% chance that somone will win the SB), so the ral proability is probably around 2 in 3.
This means there is a 1 in 3 chance the SB goes to someone else which compares to the favorite Lions 22%. It is just the chances of an individual team is getting quite low after the top 4 teams (the Ravens are fifth favorite with an implied probability of just under 8% then the Packers, Vikings and Steelers at about 4% each.