Iggy is satisfied that the 8 potions are (coincidentally, given the quotation) of Cure Moderate Wounds.
The Githzerai and Githyanki look the same to you, but perhaps if you travelled amongst them long enough you would pick up on the differences. T'Zeran does appear to wear a differet style of clothing then the Githyanki you fought.
With some difficulty, you manage to get T'Zeran out of his manacles. Does anyone wish to keep these?
"I am to take you to a color pool... a gateway between this realm and another. The difficulty, however, is that it lies well within the portion of the astral controlled by the Githyanki. I am no student of history, to explain how the Githyanki have come to hate my people, but if they were to see us among them they would certainly strive to kill us. Even seeing you, strangers though you are, they would likely react with violence."
"This may seem impossible, as the might of the Githyanki is great, but I have had several years to think of how it may be done, and I have arived at a plan."