A couple of problems I have with Corguevais that I have no answer for: Why during the quest lines does he wear two different outfits (see below for pictures, no other character has done this)? And why would an outsider Ala Mhigan have such a prominent role in a parade as the Goobbue handler (or something along the lines of keeping the Goobbue asleep). Corguevais would be an outsider, Ul'dah wouldn't have put a refugee in this kind of position.
Greinfarr says the 2nd set of robes remind him of what Garleans wear. Dunno where he would have seen one except maybe from an envoy as I doubt he had been to the recently occupied Ala Mhigo.
As for Greinfarr and Frenzy, it just says Gerolt created 2 swords for Gladiator champions. Greinfarr had Frenzy as the Gladiator GM/Champion the other we never knew of but after Nielle's downfall we only know Greinfarr was trying to work behind the scenes to re-steal the Heartstrike but we don't know if he still had his sword. He either gave it up after he left the Gladiator guild or was captured and had to give up the sword, since he's in Halatali now he was probably captured. Aldis then becomes champ and obtains Frenzy. But rather than becoming a puppet for Lord Lolorito he just exiles himself, taking the sword with him.