I don't know how I missed that change in suspension. The direction I gave you would be for the underlined part above. You have a choice with this quilt. Let us know how it works for you over time. If it stays in place and has no bunching, like the original design did.
The Greylock 3 under quilt comes equipped with full length, channeled shock cord suspension that allows the user to make minor adjustments to their under quilt position. For those desiring to use the traditional JRB corner under quilt suspension the Greylock also comes equipped with corner mounting tabs.