As for Silva, they had to adjust a lot, since he was a bit of a loophole. They recorded everyone who went through the array and everyone who went to the party, so it was a bit troublesome as there was a chance of him being recognized in Bleulle.
While they could make excuses and explanations, he could become a small thread or clue that could be used in the investigation, just because of his association with the Golds. Even a seed of suspicion could get troublesome, especially when the seed was in any way or form related to the Golds.
Alterra didn't even want him there at all because of this (they were planning on making him travel back to Alterra some other way after the rescue). However, when the Lord Evos allowed them to bring a servant for each party, the Lord questioned why they'd leave a capable guard behind, and that was that.
Silva's mission meant he couldn't leave without Lady Zinnia, so when the lady stayed, so did he.
