This theory describes a path that the other animatronics took. Take a look at this picture of baby from the FNAF World Wiki 
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Now take a look at this purple guy image 
Coincidence? Baby MAY have had control of Ennard at some point, but then the consciouss of the little girl as Ennard took over and decided she didn't need baby anymore. I dunno, let me hear what you guys have to say