I'm gonna copy paste Medikor's response here for those too lazy to click on the link XD Thanks Cass, for the heads-up.
Quote:
Originally Posted by Medikor
I just gave Peas a watch and something struck me very early on in the episode. I believe Peas is actually a representation of us Frankie fans. Peas was pleading to the other friends about how ungrateful they are about everything she does for them and the house but his words, much like ours, fell on deaf ears.
Like us, Peas truly appreciated Frankie yet was unable to let her know or cheer her on when she needed it. But what really intrigued me was that he did eventually manage to help her out. I may be grasping at strings here, but I really feel that the people behind Fosters made this episode as a nod to us. Yes it was hard to see Frankie actually be hard on herself, but I honestly feel that it was us that helped her pick herself back up and help her out when she needed it most. 
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That is indeed an extremely valid point. Hmm. Okay, Peas is forgiven. ...Not. Not entirely, no.
Just rewatched Imposter's to refresh my memory and I take my words back. Imposter's is an episode I NEVER want brought back. Urgh.