This is the only way to conduct science, if your theory doesn't have any observable consequences then it's metaphysics - and should be treated as such. Maybe the match will be maneuvered to the 'Metaphysical Mosh Pit'. The situation is similar in General Relativity. Rather than assuming that space is curved, one can instead assume that space is flat, but there are universal forces acting on all sources of energy and momentum. Ken just may have rescued this whole match from the metaphysical tone it was aquiring.
Acceleration is a very real property.
In fact, it also has the distinct advantage of being measureable anywhere. You see, there is another property of acceleration. It provides its own reference points. But I don't get the connection. This is the first weakness we've seen in Ken this whole match.