Interesting observation.

I can see the Antelope, with one inch more loft providing an addtional 5° rating over the Veralite. But why the 5° added rating of the Kodiak over the Antelope with the same 7" of loft.

My first thought was to check some other features of these bags. But, alas, they all have continuous baffles, single draft tube and full collar.

So, disregard my questioning mind. confused

I`ll await smarter folks than I to offer an explanation.