Thanks for pointing out the rivalries correct, because Dortmund-Bayern rivalry is indeed pretty recent (although they were rivals in the mid-late 90s too).
Other than that, the last paragraph contains a lot of wrongness.
1. Bayern have a rampant history of systematically weakening league opponents: Some examples to put things into perspective:
- Calle de Haye and Lothar Matthäus from Borussia Mönchengladbach in the eighties, weakening the only real rival in the league.
- Mid-eighties: Nürnberg becomes a serious contender: Bayern sign Hans Dorfner, Stefan Reuter, Roland Grahammer and Manfred Schwabl, effectively banishing Nürnberg to mid table again.
- 1989: Köln become a serious competitor: Bayern buy their by far best and most important player Jürgen Kohler.
- 90s: KSC becomes a serious contender: Bayern sign over the course of a few years Michael Sternkopf, Oliver Kreuzer, Mehmet Scholl, Oliver Kahn, Thorsten Fink and Michael Tarnat. In 1998, KSC goes to second division
- 1991: Kaiserslautern wins the league: Bayern buy Bruno Labbadia. Two years later, they buy Marcel Witeczeck and Ciriaco Sforza. 1994, Kaiserslautern go to second division
- 1995: Bremen become a serious competitor: Bayern buy Andreas Herzog and sign Rehhagel, one year later they buy Basler too. And the Bremen-case repeats here: 2005 they buy Ismael, two years later Klose, 2008 they buy Borowski. They even signed Jan Schlaudraff just so that Bremen can't get him.
- Stuttgart case: Bayern destroy the 'magic triangle' by signing Giovane Elber.
- Around the turn of the millenium, Leverkusen becomes a strong opponent: 2001 Bayern sign Kovac, 2002 it's Ballack and Ze Roberto, Lucio in 2004.
I'll stop here and believe me, this list goes on and on and on. Trying to relativize that with the Reus-transfer is inappropriate. And fyi, Dortmund signed players from Bundesliga teams too - but not to systematically drive them out of competition, unlike Bayern, who have a recurring scheme here. Götze and probably Lewa are a part of this scheme.
2. Klopp is a mindgame specialist, at least equal to Mourinho. Comparing him with Hoene?? though is not going to happen, because at no point did Klopp try to destroy careers, much unlike Hoene??. Google what he did to Willi Lemke, to Christoph Daum or the referee Helmut Krug or to the management of 1860 München for that matter.