I suspect the bookies predict the match will end in a draw bookies are unlikely to predict Brazil lose because they are unbeaten so far
Besides that Brazil has 4 matches left in this tournament meaning Brazil only needs 2 more wins to secure the standings , Brazil can get it against Paraguay and Bolivia so don't be surprised if Brazil play to avoid injury.
Despite the unexpected course of the match, your analysis turned out to be correct. Brazil has reached the minimum acceptable result for them and Ecuador too. Now the main task of Ecuador is to score at least three points in the remaining two matches with Peru and Paraguay (I immediately discard the match with Argentina, assuming that Argentina will win) and then they are guaranteed to get a ticket to the World Cup.
For Ecuador I'm sure they will be safe a struggle will ensue between Peru and Paraguay because one of them has to go through the play-off path
We can see the result at the end of March when the two countries meet each other with Uruguay slightly advantaged as a home team In the last match the two countries drew.