Any such discussion is entirely in the realm of not science. Non-observable means not falsifiable means not science. Saying the non-observable universe is going faster than the speed of light is like saying God’s beard is orange.
I was going to correct that technicality on observable but was on mobile earlier.
Also you can absolutely have a theory that explains the observable universe reliably (i.e. Verifiable) but at the same time makes suggestions about the unobservable universe (for example most cosmos theories say the actual universe is bigger than the observable). We just don't have the technology or time to observe it yet.