By "appropriate for the rain" I assume you are getting at how the sole will hold up to rain (as opposed to traction, or the upper). I haven't seen any evidence that the "double waterloc" sole necessarily holds up better over time and a range of real-world conditions than a conventional double sole, let alone a double sole with topys (with comparable care, usage, etc.). My personal opinion is if it keeps my feet dry, it's fine in the rain. I have yet to see a sole spontaneously disintegrate because I stepped in a puddle.
Yeah. I meant both the sole and the upper. Alden's double leather soles are pretty hearty; as long as they get some break in, I would imagine they would be OK in rainy conditions even without topys. I also was talking about the upper, though. I prefer not to wear cordovan in the rain because of the "bubble" thing that happens to it (I know it goes away with brushing). Wearing cordovan in bad weather is probably fine on boots like the tanker or alden but I don't know how often I would want to do it with longwings, PTBs, loafers, etc