I do agree with that, it allows some space for projecting. Though I did find Mr. Collins' character more sympathetic in the context of ASD.
Yeah, still following, but have nothing to offer but speculation and opinions.
In case of the bullied child, she/he would need some other symptoms and traits, and there's still a difference between reluctancy and inability (I concede to it being a very fine line in practice!). So, while having issues most likely stemming from low self-esteem, it wouldn't 'really' be autism (misdiagnosing happens however). And about the reverse thing, if none of the traits are displayed, it won't be recognized as such, so even if your theory is true, how are you going to prove it?