So the Inbetweener is powerless against Lord Chaos and Master Order and the Spectre slaughtered all the Lords of Chaos and Order. The point is the Inbetweener's masters are equivalent to the guys Spectre was crushing in DOV.
I have never seen Order and Chaos do anything that would put them above Nabu or Kismet. The Spectre is being seriously underrated by anyone who thinks a Galactus level being has a shot in hell of beating him.
Well alot of Strange's powers involve calling upon/summoning some mystical or cosmic entity, so it is kind of a matter of opinion whether to count him summoning Order and Chaos as a win. Technically it wasn't his power that beat the Inbetweener.
That is what I am saying. With Dr. Strange the use/summoning of other entities' powers is so central to his powerset, that it is difficult to dismiss an instance like summoning Order and Chaos to deal with the InBetweener as not counting as a feat for him.