Galaxies are not actually moving faster than light. The distance between them is growing at a rate that would suggest FTL speeds because the universe is expanding.
looks like you didn't get it that the drive i linked to is supposed to use the same principle of space expansion and contraction.
Galaxies are not spaceships. Just because the natural expansion of the universe affects galaxies (and everything else) doesn't mean it's possible to artificially expand and contract the universe.
just because God strikes heretics with lightning doesn't mean that it is possible to artificially create and route electrical current
The fact that cats hunt mice doesn't mean we can't have megapixel cameras.