Theo observed the room and decided that he would not like anyone to come inside the library, hence, he called Elmer.
He had no idea where Calixto, Mariano, and Linda went, or the newly turned vampires but he could not wait for them. He had to start cleaning up the mess last night. He was still seething in anger with how Iris acted towards him. He was not able to reply to her because he was shocked to learn that she was the owner of the mansion.
It did not occur to him that Calixto would make those changes for he did not see the need for it. Since Calixto had woken up from his slumber, he made a point to read all those records of his family about the mansion and what had happened during the years they were the designated caretaker of the mansion, and from those records, he did not encounter a part where the mansion owner was changed.