They fought at 135 in the past. Shevchenko could easily go back up if the desire/payday was there. Plus Volk is moving up because he can't find an opponent. Much like Valentina.
I get what you are saying, but I think it could happen soon. 3 of the 4 of the women's divisions are stagnant.And I can name you a hundred matches that never happened because they don’t cross promote or guys don’t move up.