I see what you're getting at. Section 1.D.9.b covers the ratio of MBH to DBH. The ratio begins when the first 76-Seat Aircraft is "Engaged" in Delta flying.

I guess I wasn't clear, but the ratio is re-figured every 10 deliveries, with the ratio favoring mainline higher and higher as the 76 seaters and 717's come on, and the 50 seaters are parked. The ratio calculation is different than compliance monitoring which is covered in this section:

1.D.9.c says that compliance will "be measured for the first time on July 1, 2014 and then measured again each succeeding July 1 thereafter, in each instance for the preceeding 12 months on a weighted basis [emphasis mine.]"

The way I read it, and that it was explained in the lounge the other day, is that the bolded part above prevents the loophole that you were suggesting. Thanks for engaging in the conversation though. You made me go re-read that section, which is a good thing!