this whole hair typing thing is new to me and i'm not sure i fully understand it myself. BUT when i was looking at the chart and the descriptions of each type 3c says curly-kinky which is bascially what these looking to call themselves 3d or 3c/4a seems like to me. i think the misunderstanding and diffculty figuring out which is what comes from mistyping and/or diffculty seeing the true pattern in pictures. as someone stated, you can't really get a good feel for the curl pattern via photos due to various issues (angles, glare, picture quality, etc.)
i guess i'm a 3c and i chose based on the description, not the pictures. i feel like we just made this way more difficult than it should be.