Agent Sky mixed up some Thees and Thous, didn't he? It can be explained by the knights' casual adoption of Olde Speech. Also did you see how Aiden had no idea what he was saying? :P That was a throwback to the foreign language joke. And the LARPing / blathering is meant to reflect an unfamiliar reader's possible perception of the KOTOS story, because it is quite absurd. The knights really are pretending to be knights, they are a mercenary group with a medieval theme. Luckily, or not, that is how Matthias wound up finding them.
It's very natural that Aiden has forgotten about the Killian/KOTOS connection, even though Killian explicitly mentioned it during their (very short) reunion in 3028, as so much else was going on and has gone on since.
Alex was single in his last appearance, but life moves on.