If the Krew have Tenzin and Lin, they win. Lin can sense when and from where Yun is coming, so assassination techniques are going to be of limited use. And in a straight fight, even in this location, he would need to devote his full attention to any of the big three - Korra, Lin, or Tenzin - by themselves, and he is losing to any combination involving two of them. Jianzhu would get beaten by the rest of the team working in tandem.
If the Krew lack their mentors, then they lose. Korra would have her hands full with either Yun or Jianzhu, both of whom can solo Mako, Bolin, and Asami, and then the pair would tag team Korra.