Re: 'All Our Yesterdays' theory
Why did they bother doing the whole "Send everyone to another time period" thing as a method of evacuation instead of just...well, getting in ships and evacuating? If they were advanced enough to make a time portal, they could make rocket ships...
We can't assume that, since we're never given any information about the Sarpeidons' spaceflight capability. Technical advancement in one area doesn't necessarily mean the same level of achievement in other areas. It's like asking, "If we can send men to the moon, why can't we cure cancer?"
“All the universe or nothingness. Which shall it be, Passworthy? Which shall it be?”