My opinion is that he probably does not purr for you because he knows you want him too!!! jk
I wouldn't take it personal because he gets in your lap for snuggle naps so he must love you very much.
I really think it has been far to long since we have seen pictures of these two adorable boys. *HINT HINT* Do they still get along and snuggle together? Like they did in pictures! *HINT HINT*