No one bothered to ask Thailog how he survived the fire in "The Reckoning." No one even seemed surprised that he was still alive.
Thailog: You're looking good, Goliath. A pity I can't say the same.
Lexington: Is it just me, or do the clones look worse?
Hudson: It's not you, lad. Each tick of the clock has become their foe.
Goliath: For millenia, Earth's wisest creatures have stood in awe of the miracle of creation. But modern science has given the world the tools to challenge nature, to give life where none existed before. Such power is as intoxicating as it is perilous. The consequences of its misuse may weigh heavily upon us all.
Elisa doesn't appear in this episode, despite Salli Richardson being credited as both Elisa and Delilah in the credits.