When they were talking about a S.H.I.E.L.D. base, and someone designing that technology to reach out to the Nova Corps, I was really really expecting Fitzsimmons to be there, because it's just their kind of thing. You would expect them to be fighting against the zombies. Also, in this timeline, Fitz would have never died like he did in S5 because the end of AoS S5 lines up with the start of Infinity War, and since the zombie outbreak started around the time Daisy defeated Talbot, it's very likely that Fitz never died. And once they got to the S.H.I.E.L.D. base, I was really expecting an agent of S.H.I.E.L.D. or two, but then it was just the cast of Black Widow, which was fine.

Who knows, maybe they can be in a hypothetical Season 2 alongside Bucky and other survivors.

Was expecting these two to show up in Marvel Zombies