You're reading it wrong.
At the start of the season, the bookies publish their handicap lists. Every team is given a handicap mark. Back in August, Bet365 made Leeds the Championship favourites, so they started with a handicap mark of scratch (+0 points). Next in the betting came Burnley, who were given a +6 point start. Then Luton, who were given +10 points, etc, down to Oxford, who were given +36 points.
All teams are priced at 18/1. The bet is to finish top of the handicap table, not simply above whoever turns out to be top of the actual Championship table.