RB Leipzig have made an early season statement when they came back from two goals down to hand champions Bayer Leverkusen a first Bundesliga defeat after 35 matches. Saturday’s 3-2 victory sent them top of the table and showed that Leipzig not only have a life after Dani Olmo’s move to Barcelona but also could emerge as a serious contender. “We must believe in ourselves because we have unbelievable potential,” sporting director Rouven Schröder said post-match. Schröder spoke of “a fascinating match” in which former Leverkusen player Kevin Kampl and Lois Openda’s brace turned the tide after Lei…