Reading through the Strzok-Page texts released today and
it seems they had another person either investigating or a witness, "Dragon", maybe someone they thought turned on Trump, because the mentioned covering for him
Read the texts, it sounds like the Russian guy from NY, because NYO was interviewing him. The mentions are on page 39, 40, 43 & 44
the last one mentioned Huma on page 39
so far: Crossfire Hurricane, Crossfire Razor, Crossfire Typhoon & "Dragon"