The reason why Fracture was replaced

** This is my investigation on why Fracture got replaced.**

So Fracture was one of the main members of Steeljaw's original pack in Season 1 of Transformers Robots in disguise. It felt so strange that he was'nt back in Season 2 and Quillfire was freed instead of him in Season 4.
According to Adam Beechen,Fracture was too independent minded and that Steeljaw would have a hard time to control Fracture due to him wanting to get revenge on Drift and get the bounty on Bumblebee. To be honest,this reason is bullshit because Steeljaw actually wanted to get rid of Bumblebee.
Meanwhile,Andy think that the reason why Fracture got replaced is because Fracture is too dark for kids. I don't think it make sense because Fracture got a McDonald toy. Why would he be too dark for kids? His maturity? 
My theory? I think it's because Quillfire is a more funnier character and kid friendly. Quillfire is used for the comedy relief of the pack. Maybe kids enjoy more Quillfire. He became a popular character and I believe that the writers of the show seems to like Quillfire that much. Another thing is that apparently,Quillfire is close to Steeljaw since they might have been close friends for a long time. My second theory is that it was the High Council who actually sent Fracture to begin with alongside Drift. When Fracture failed his mission,Cyclonus thought it would be best to choose a more competent Decepticon to get Bumblebee instead of sending him back to Earth. That choice was Quillfire.