Your #223. Excellent. Something else that should be factored in are followers of apparitions and/or private revelation, whether approved or not. Whether for good or for ill, they have a huge following and their own unique theological emphases and sometimes generate separateness or exclusivisity.
Likewise, "Extreme Modernists" who manipulate Catholicism in weird liberal ways also add to the divisiveness. I would include the Bernardin-Weakland style of modernism which has been popular among a certain segment in the church in the U.S. John Kerry falls into that category.