90% you say. Lewandowski is the only player on Bayern that came from Dortmund and shocker you have no idea what youre talking about, he came on a free. Mueller came on a free. Neuer came on a free. Nubel came on a free.
Lets take a look at the current squad. Coman, Hernandez, Thiago, Boateng, Martinez, Pavard, Coutinho, Tolisso, Davies all came from outside the Bundesliga. Sule Cuissance, Goretzka Gnabry Kimmich and Neuer all came from within and at a very young age before they were stars. We bought Goretzka and Gnbary for a comninbed 8.5 million euros.
So 90% right? We keep just waiting for superstars and taking them from all the poor old teams against there will. Why didnt we buy Havertz, or Timo, or Aubemayang, or Kevin De Brunye?
Continue pushing that false narrative though, everyone loves to. If you want the Bundesliga to be more competitive, maybe you should complain to the clubs that keep letting their players leave rather than to the club that actually wants to be competitive internationally.