Those are very big and important differences. And obviously, those numbers justify any school leaving CUSA for the "Big" East even if it just ends up being the old CUSA.
But that difference is going to shrink considerably after next year. The difference in an "AQ" BE (that's also a basketball powerhouse) and a "non-AQ" CUSA is much larger than the difference between say, CUSA and the SB. And going forward (once AQ goes away, and much of the BE's b-ball power), the new BE is basically CUSA, and the new CUSA is not too far off from the SB.
It's still better. But it's not going to maintain the kind of distance you're showing for next season.