This is the point of the experiment, can top team beat the odds or not!?
Bookies offer odds, but they don't offer really chances for it more like risks for gains percentages, if those were really chances you could go by all results and turn the whole thing into a predetermined outcome, bookies have no way of dealing with you a blow if Madrid for example goes on a rampage and beats every single team in the championship, and if they fail once in such a streak the odds for the next match after a failure would definitely pick up.
There is no perfect strategy in gambling, especially in sports betting; it all depends on what you want. If you're trying to build a balance, picking bookies' favorites with a good stake amount is the right strategy; no risk is taken. However, if you already have a good balance, you can always try a more risky odds parlay with a minimum stake once in a while; it doesn't always come, but when it does, it covers all initial losses.
I enjoy betting on bookies' favorites, but anything less than 1.40 odd is a waste of time for me. Football has changed, bookies' favorites struggle, and there are always upsets, but it is still a better strategy to accumulate profits..