Taking this to your page so we don't get in trouble for de-railing the thread.
Yes, it's for Dragon Days and Maturity will enter GSC soonish. I'm just trying to sort out the plans definitively. It looks like there's going to be a grand total of 40 chapters so there's not that long left in it.
If you wanted a Rival's Story II though, Ryuutakeshi wrote something from the POV of Silver in HGSS. It's pretty good. Check out his started threads and you should be able to find it - it's called Son of Earth.