Whelp. Orion DOES have a side quest on the AC. Since it is clearly tied to the AC (starts on the AC home page in the news section at the bottom) and does not award plot points, I'll put the info here rather than in the plot thread.
Orion AC Side Quest 1
Hello there... sorry I'm not very good at talking to crowds... b-but Sigmir and Sweet have graciously allowed me on today as I have big news. F-for those who don't know me, I am Orion O. Ophiuchus, and I have recently been, let's say gifted, with terrible visions that s-seem to be at their strongest when many Neopians gather together. If I w-wasn't able to make your acquaintance during the Festival of Neggs then this must seem very strange to you, but nevertheless, I am h-here to ask for your assistance once again. M-my visions are still not very strong, but this time I can at least see pieces of them, however, they appear very distorted now. So... as a possible solution I...I thought perhaps the fans of the Altador Cup could help me with this predicament! I will share my visions here as they come to me and, hopefully, some of you may be able to recognise something from them! I'll be doing my best to search too, so if you find any place that seems to match my visions, just wait for me there and I'll make my way over to you soon!

Click on "Offer Help" and "Explore Neopia" and go find the location of the MPIC puzzle.
Solution:
Thank you for leading me here!
I looked around and found this strange stone with writing on it, embedded near the top of the tree this store is built into!

It must have been placed there so long ago that the tree grew around it! How old do you think it must be then?
Orion: It seems to be part of something bigger though... perhaps my other visions will lead us to the missing pieces?
For now, keep cheering on your team at the Colosseum, and keep an eye out for me in the news there!
Oh and here is a reward for helping me find this!

Fluffy Gruslen Rug Wearable






Skull Punch Handheld

Frozen Pendant