Notice that he was willing to comminicate with Mrs. Ramsey but not Mr. Ramsey. This tie might go way back. The name JOHN RAMSEY name is what tickles his brain...not Jonbenet...not Patricia. Why doesn't he refer to her as Mrs. Ramsey??
"he" as in the unknown to us perp or he as john karr being the perp?
"He" did refer to Mrs. Ramsey, in the practice note.