the parts of DS9 and VOY that aired after First Contact would have to be different timelines, as Seven of Nine was aware of the events of that movie, and even called it a paradox at one point.There has been a prevailing fan theory that the *original* timeline was with Zefram Cochrane making his flight, with no help from people from the future, and no Borg trying to shoot his ship down. Those events led to TOS, which led to TNG, DS9 & VOY. But the changed timeline with the events of FC led to ENT, which led to DSC, which led to SNW, which led to different versions of TOS, TNG, DS9 and VOY, which led to LDS, PRO and PIC, and now SFA.
That's a theory that I can get behind.
The signal sent at the end of ENT Regeneration is also why the Borg are in the Alpha quadrant by the time of TNG.
There's other Ent episodes intended to be prequels to other episodes as well.
But writers intent is that ENT is a prequel to all the other shows (the ones that existed at the time at least), anything that happens in ENT already happened from the perspective of the later shows.
There is no alternate First Contact theory, it was a paradox.


