Champions Bayer Leverkusen squandered a 2-0 lead for the third time in six Bundesliga season games in a 2-2 draw with lowly Holstein Kiel on the second anniversary of coach Xabi Alonso’s arrival on Saturday. There was also no luck for Borussia Dortmund who crashed 2-1 at Union Berlin, their second domestic defeat after mid-week Champions League success. Leverkusen were 2-0 up after eight minutes from Victor Boniface and Jonas Hofmann, but Max Gschwill on the stroke of half-time and Fiete Arp’s 73rd-minute penalty gave the visitors a point that had appeared impossible early on. Leverkusen had a…