[quote=@Vilageidiotx]
<Snipped quote by mdk>

These are the consolation points of grammar. Things you can technically do, but shouldn't. They might be allowed, but grammar was always the main focus of immature writers anyway. The big boys worry about syntax, and the syntax of sentences that use resumptive pronouns seems to be pretty goddamn awful. 

The writer who uses resumptive pronounces, sounds like yoda does he.  
[/quote]

Lolol good observation.

A lot of it is because of movement in syntax. Things get wonky.

But anything you can do in a language is grammatical. Like ending sentences with prepositions in english. The only things you "shouldn't" do are what constitute structural errors. Misusing "'s" is a structural error . you can get away with it if such errors are common ('could of'), but you risk leaving the grey zone of grammaticality and generating word-salad.

And grammaticality is just defined as whatever a native speaker would say. That gets subjective pretty quickly.