From what I understand Ceej, you're right. Cushlon is a soft but very resilient foam.
CUSHLON foam can be paired with Zoom Air, Max Air, etc.
Take for example the Nike Moto (courtesy of Ernest @ Nike Running):
The Moto features Nike CUSHLON foam, which is paired with a Zoom Air unit through the forefoot (the CUSHLON actually extends over the heel as well, where it
sits above the polyurethane "cassette" that houses the visible Max Air unit.
If you're running a lot, CUSHLON- or CUSHLON ST-based running shoes have received plenty of praise (although some people say it's TOO soft).
Hope you enjoy your Cradle Rock Lows, OP.