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Who is Yenndo from Five Nights at Freddy's 5, and what is his purpose in the storyline of Five Nights at Freddy's 5?

Is it possible that Golden Freddy was still around in Five Nights at Freddy's 3 while the other animatronics became phantoms?

In Five Nights at Freddy's 5 we all come to know that there are 5 animatronics, but there was one animatronic that we come to know later on that was never included. Why did Funtime Chica never appear in Five Nights at Freddy's 5?

Why does Scraptrap from Five Nights at Freddy's 6 look oddly different from the Springtrap we're all used to in Five Nights at Freddy's 3?

Why, in Five Nights at Freddy's 6, does Molten Freddy's voice resemble that of Funtime Freddy from Five Nights at Freddy's 5?