A theory can be tested. A speculation hasn't even gotten to that point.
Real science is figuring out the unknown not making a big deal about the known. Even is quantum tunneling can work that does not mean it can work with macroscopic objects. So all FTL methods in fiction are over the line into the UNKNOWN. They may all be IMPOSSIBLE. So a writer can either make a good story with one of them or not.
And the "experiment" of a vertical self supporting structure being completely collapsed by its top 15% was done where?Originally Posted by Steven L Jordan
none of which can be extrapolated from current scientific theories or experimentation.