I guess your point is, they are not the elite top top tier. They sell their best players. Right?
But my point is that a manager who wins with Dortmund against Bayern is absolutely world class. Like Klopp.
The Porto comparison makes no sense in that regard.
Beating Bayern in a 34 game league campaign is a mammoth task.
Crazy to think that Klopp is still the last manager to beat Bayern to the league, and not just once, but he won it b2b.