Dortmund should be a contender for the trophy this season as they may be one of the closest teams to rival Bayern.
Why?

Eric Ten Hang, what exactly are you doing here with this Bayern Leverkusen team? I'm just wondering because initially I thought it was going to get better as more days is passing by with him as the head coach of Leverkusen but it's not. I'm still wondering how they will cope when their league season officially starts in few days time.
You do realize that was Bayer U19 team that played there, right, with players that almost never played together?
It wasn't even an official friendly match, it was training behind closed doors
So? Do you also realise that the team Eric Ten Hang team played against was a junior team. Roda is a Dutch second tier division team. There's no way he wouldn't field at least two or three senior team players. We often see lineups like this in different leagues when a big team is about to play a division team, this mostly happens in cup games. They mostly use junior players with two or three senior players to play the match.