Yes to all this!! I would love for Sigma and Rose to meet somehow, and I am totally down with him having been there for her scoring. She's going to be very noticeable in the arena too, between one of the fancy wands exploding in her hand and then later causing general chaos once she makes some fake ones out of sticks or whatever. I intend for her to eventually go down while trying to explode stuff after catching the plague.

Also hell yes knitting club.

Generally I will say that she'll be wary of him, knowing he's obviously someone employed by the Capitol, but she'll be pretty good at keeping a lid on it. She'll need to gather info on this place and everything, and she can't really do that if she's making a big target of herself. Hope he doesn't mind snark, though.