Borussia Mönchengladbach triumphed 5-2 over Cologne in the Bundesliga’s Rhine derby on Sunday after visiting midfielder Florian Kainz was sent off and conceded a penalty minutes after scoring his own. Leaders Union Berlin visit VfB Stuttgart in the late game with second-placed Freiburg at Hertha Berlin before then. Bayern Munich missed the chance to go top on Saturday when they conceded a stoppage-time equalizer in a 2-2 draw at Borussia Dortmund. Hosts Gladbach, who moved up to sixth with the win, took the lead via Marvin Friedrich’s shoulder following a corner on 27 minutes. Cologne soon lev…