[HitoriTomoyo]

I agree, she arguably has the worst position of any character in this series.

Spoiler:

I can picture some of the above spoilered speculations occuring, particularly where Mami would manipulate Madoka through Sayaka; if this show were to deviate from the standard positive Mahou Shoujo archetype, which it is giving hints that it may be, then it's pretty clear that, somewhere along the way, Sayaka and Madoka are going to go their seperate ways.

I WANNA SEE HER MAHOU SHOUJO POWERS IN ACTION.