Exactly my thinking.
We know both on-axis and off-axis responses are important, so is there a consensus on whether the 5-point "average" of on-and-off-axis is the "best"?
Well, I don't know if anything other than a complete collection of independent graphs all taken
in the room you will actually listen to them in could ever be described with the superlative "best" - but it certainly provides a pretty good one-graph solution for us to use as a starting point.
That's part of why the graphs and even salesfloor auditions can only tell part of the story. Say you have a speaker that is relatively flat on-axis and decent at 60 degrees off-axis but with a -5db dip at a certain frequency. That chart wouldn't look great... and if you listened to them in a room that had problems with cancellation at that same frequency - they would sound horrible.
However, if say your room allowed direct sound to reach you "un-tainted" but the first reflections to have a boost at that point of 5db (or more accurately to reduce every frequency except the area of the dip by 5db). In this admittedly completely fictional room - those speakers would beat anything else in the world in theory. On the other hand a speaker that was nearly totally flat at 0,15,30,45,and 60 degrees but had a 1db
peak at the same frequency the first speaker had the 5db suckout at.... it wouldn't sound nearly as good (in that room) but it would graph
significantly better (in-chamber).
On a side note I now see that the Revel's have replaced the KEF's in your sig.
I wonder how many more times that will change before they are physically present next to your Orions.
(Which I'm extremely jealous of BTW... congrats again!)