Discovery about Mike is impossible, as then he would certainly go to jail or at least leave Pearson Specter, as unlike Rachel, he hasn’t gone to any law school. And Jessica is actually the one who would rather fight Louis, Harvey in some way even likes him more than than Jessica.

We also can’t forget that Robert Zane is in the picture. This is key because they brought him into this episode and made a big deal about the favor he made by bringing it up with Mike later on. Robert Zane is going to collide with Pearson Specter (Litt?) at some point next season in a very high profile deal, he’ll probably try to call in his favor and Harvey won’t be able to budge. Mr. Zane will then dig into the reason why all these people were pushing for Louis’ hire before taking him back and naming him as a partner. There may be a direct attack on the firm and a discovery about Mike that could cause some issue in his relationship with Rachel; after all, we can’t forget her warning that she didn’t ask her father for anything for a reason.