He did not express intent on breaking the caucus label on your thread as he did not state intent on going over and posting on your thread anyways, ignoring the caucus label.
He posted this one so that he would NOT break the caucus label on the thread you posted.
Whatever it's source, nobody on FR owns the rights to posting form it nor can they prohibit others from posting it as well. Clearly the RM doesn't have a problem with it and HE'S the one with the final say.
If you don't like the rules, take it up with him.
It seems that there's a real lack of understanding about what the caucus designation is for.
After a length of time, at least one day, anyone can post an article in the Religion Forum that has also been posted as a caucus.
Many times those of other faiths wish to be able to comment on an article posted as a caucus so they will post it on the open forum.
That seems to be the case with this thread.