Off those 12 teams that have qualified, 11 are from the 6 top nations in Europe.
There are 5 chamions. 3 runners-up, 2 third placed teams, and Benfica who were in a two legged play-off to qualify for the league stages.
The exception is Brugge (Belgium Champions) from the 12th best nation.
The 11 from the top leagues will increase to 13 when Group D gets decided.
So a guaranteed 13 out of 16 from the top six leagues, if Milan from group E and Leipzig from group F qualify then it will be 15 teams from the top 6 leagues.
The "competition" is just a money making racket.