I have tried DCin on dry hair a few times and I haven't found it works for me. Dcing on wet hair has been better. The conditioner just seems to sit on my hair when its dry and I didn't see any additional moisture. I also have to use more conditioner when its dry, its harder to apply [...]. It definitely does not feel as good after the rinse as when I do it on wet hair. Just my findings.
^^ This!
This was my experience with dry DCing with AO products (some of my absolute favorite DCs to use on wet/damp hair with or without heat).
Dry DCing didn't do anything for me. I don't want to repeat everything
faithVA said, but those sentiments almost completely mimic my own. I didn't have good results, and I ended up using wayyyyy more product (it just didn't seem to spread as easily). So for me, dry DCing is a no. Maybe it's because for low-po hair our cuticles aren't open enough to absorb the product when dry.
I also get more moisturized hair when I baggy overnight versus just M&Sing under a scarf.
ETA: If you want to try dry DCing, I would probably spritz hair first then use a plastic cap, wrap your hair in a towel (or use heat), and do it for a few hours. All of these other things should help the DC penetrate the cuticle better.