VfB Stuttgart coach Sebastian Hoeness showed Bundesliga leaders Bayern Munich the utmost respect ahead of their clash on Saturday, despite the Bavarian’s poor form in recent games. “It’s the biggest challenge that you can have now – in Germany, maybe even in Europe,” Hoeness said in a news conference on Thursday. Bayern are coming off two Bundeslia draws against champions Bayer Leverkusen and Eintracht Frankfurt, and a Champions League defeat to Aston Villa. But Hoeness stressed that Bayern “are back to their old strength” after the past season, in which they failed to win a trophy for the fir…