From a scientific perspective, you don't even get primary/secondary in the right order.
I love me some Dual Pistols, however, unless you're running cryo or chem rounds it brings very little support to the table (and most players would argue that the only thing to run in 99.9% of content is incendiary). So I would disagree with the assertion that it is the best for support. Additionally, it is not top tier for damage either.
I'm not going to argue about which defender primary provides the best support. It really depends on way too many factors, including what content you're playing. I'll agree that Time is up there, but not 100% sure it's the all-around best of the best.