It just so happens that the "Dave Chappelle Theory" is congruent with Dave Chappelle's cousin's story. 

Here is Dave Chappelle on Oprah corroborating his alleged cousin's story. 

Dave Chappelle's interview in this clip corroborates the alleged cousin's story.

Here's Dave Chappelle's cousin telling a story about how she believes Dave Chappelle was replaced by someone else.

 https://www.facebook.com/latanster/posts/1043604415781882

 https://www.facebook.com/latanster/posts/1043606119115045

https://www.facebook.com/latanster/posts/1043606845781639 

 https://www.facebook.com/latanster/posts/1043616629113994