system
Given the following post, respond as if you're commenting on Reddit:
human
[Steven Universe]Rose Quartz never meets Greg or give birth to Steven. How do the Crystal Gems deal with their challenges? (Spoilers)

Greg Universe heads to Empire City a day earlier and never meets Rose Quartz. As a result, Rose doesn't fall in love with Greg or any other human, never gives birth to Steven, and is still the leader of the Crystal Gems during the time of the show. How do they deal with the resurgent challenges from Homeworld?

While Lapis Lazuli would likely remain stuck in a mirror in Pearl's gem, so she wouldn't return to Homeworld and give them any information, assume Peridot still is scheduled to send her droids to check on the cluster. Otherwise they are pretty much doomed through ignorance.

1. Were Homeworld to send Jasper and Peridot in an armship could Rose defeat them? How would she react?
2. Could Rose pacify the cluster the way Steven did?
3. Would Rose choose to reveal herself as Pink Diamond at any point?
4. Even if she did would that be enough to change the other Diamonds' minds?
5. If she does, how does she deal with >!Spinel, armed as she is with a weapon that resets gems?!<
gpt
Option One: Since they never built a house without a Steven to live in it, the robonoid droids land undetected at the warp pad outside the temple, teleport to the Galaxy Warp, repair it, and then Peridot, uninterrupted, sees no evidence refuting the evidence that Crystal Gems are still around, heads to the Kindergarten, does maintenance and check-up on the Cluster, teleports back and the Crystal Gems never know. In about a year, the Cluster hatches and Earth explodes, killing the Crystal Gems along with the planet.   


Now, if we're being very generous, and assuming that Rose spotted the Robonoids at the same time that Steven did,, we have a different scenario. Everyone trusts Rose's judgment, so Garnet begins using her future vision to figure out where the Robonoids would land. They make it to the Galaxy Warp, but without a Crying Breakfast Friends sticker to make her wary and immediately bug out, Peridot then immediately warps to the Kindergarten. The Crystal Gems then break the Galaxy Warp, before following Peridot to the Kindergarten. There, they discover the fusion experiments, demanding answers from Peridot. Peridot is now trapped on Earth, overpowered by the four of them, even with her tech, as Rose is just that much more powerful. They get the information about the Cluster from Peridot as their prisoner. Rose isn't Steven though, so she sadly is forced to kill the cluster to save the planet. It hurts her, but she doesn't see another solution. 

Peridot is bubbled, and no one cares to check up on her. Blue Diamond shows up for a visit, and then leaves without encountering any of the Crystal Gems. Rose hides in her room for the duration of Blue Diamond's trip to Earth. Eventually, another Peridot is sent to check up on the Cluster that seems to be growing behind schedule. Pearl has since left faked data that showed the Cluster was a failure. This... leads to Yellow Diamond invading directly. Earth needs to be destroyed directly then. Rose is forced to out herself to Yellow Diamond to stop a second war, she is taken back to Homeworld, left in a tower forever. (Earth also gets blown up. White Diamond wants loose ends taken care of.)