I've been grateful to be quite lucky with getting my lower tier dreamies. Tucker took absolutely forever to get though. I don't know why everyone voids the only mammoth villager! I think hes so underrated. Anyways, I wish you luck in getting Colton. (if you havent already, didnt read any posts besides OP ) but just keep an out on the threads, you'll came across him eventually. I thought I'd never get Ava and Grizzly but with some patience they eventually got offered to me/someone cycled them. Make sure to have lots of tbt to possibly outbid someone if needed as well, and lurk everywhere. I'm sure you already know all this though ^^
Marcel was hard to get because he gets voided so often. I was so happy to find him (twice!!) that I paid TBT for him.
I'm trying for Ankha right now and have started to notice something strange: just leading up to and over the weekend, there seemed to be a TON of threads for Ankha and now there are barely any. But there are multiple threads at the same time offering certain villagers. Is there some weird, larger uber-cycle that goes on in the background? Has anyone else noticed this?