So Dirk can still be brought back because Jane hasn't revived him, but is Jane alive or did Condy kill her? If Jane is dead, who can revive her?
We’re not sure if Jane is dead. If she is Dave and Terezi might be able to use that one fraymotif to time travel an alive Jane to this timeline. But either way we know she survives since she appears in Caliborn’s masterpiece which happens further along in this timeline.