Its not impossible, they have been really building and expanding the concepts and using characters you would not expect without taking away from its main cast. While I don't know if the guilds would be shown, it would be cool.
The take on these characters while the shell is still there or the skeleton of them, what they've done with them has been handled well.
The general look of the powers is done well too, very good with special effects.
And in yesterday's episode the cause and effect of not using the powers probably or knowing that you could be hurting the person was done well. Despite the fact, they just had to leave, that character with the memory thing didn't want to leave the agent that way and I liked that humanizing element. The fact the agent will go through certain anguish again will just make him even more dangerous.