I no longer even consider all of these teams to be a threat to Leverkusen because Leverkusen's biggest threat this season is Bayern Munich and that team has also been defeated by Leverkusen this season. So I no longer consider all the teams you mentioned to be a serious threat to Leverkusen so it could be quite possible for Leverkusen to continue this unbeaten streak until the end of the season even though it is also possible for Leverkusen to get a draw in the remaining nine matches.
Leverkusen have had great luck this Season, any Team with ambitions of overthrowing them will have to have a miracle to do it. Xabi Alonso squad looks like they will continue to be unbeaten throughout the season, because the toughest challenge has been successfully overcome. Leverkusen forced Bayern Munich to share points in the first half of the season with a score of 2-2, in the second half of the season Leverkusen managed to beat their arch rivals with a score of 3-0. They managed to defeat the strongest team in the Bundesliga, they will most likely be able to win the Trophy easily in the remaining matches ahead.