I think anyone that has pretty UL gear could get all their hunting and backpacking gear for a 4-5 day hunt into a DT3 even.
That said when it comes to hauling that gear AND hauling out an animal then I would say DT1 would be a better choice. And in reality the weight savings between the DT3 and DT1 is minimal and the size of either can be compressed down to dang near the same size. These are backpack hunting packs not just meant for hauling your backpack hunt setup in and out of the woods, there are a bunch of much less expensive options.
Thought I wanted a DT3 and a DT1 at one time so I got one of each. However I never found that the DT1 was too big, but I did on occasion wish for more space in the DT3. Knowing that I don't think that the DT2 would be the answer between the two either. Its a backpack hunting pack having a pack that has the capacity to get your gear and you kill out in the same load is very nice.