1. No poisoning happened at any Anahera party, it was at the opening of the Ballroom, where the Nobles had a gathering.
2. The Tigran you found was not the one serving wine so it is not related in the slightest
3. The Tigran at the Ballroom party did not poison anyone, he was given wine by another party to hand out, he was a servant and as such was just following what he thought to be a nobles orders. He had no idea the wine was poisoned.
4. The same Tigran who served wine at the ballroom was brought back in to serve wine at the noble gathering at the newly opened theater. He was trusted to not have anything to do with the poisoning of posidem, except for doing his job and being maliciously tricked. there were also no incidents involving this Tigran nor the drinks he handed out.Pointing to the wine he was given to hand out being the problem, not the Tigran himself.
5. Im going to go out on a limb and say you didn't attend either of the noble gatherings, the one at the Ballroom or the one at the Theater so your thoughts of the poisoning are only based on rumor and speculation.
#Leave that Tigran Servant alone
p.s. I dont know anything about this other one but I wanted to straighten this up here and now