This part stood out to me: "we owe him". Who is "we", and why "more than any of you can imagine". Sounds like the author is speaking of "we" and "you" as different audiences, and expressing that that one audience could never appreciate his contributions unless you had the information available to the thankful.
...GOOD BY=SOME IT WAS NICE SEEING YOU POST DAILY=LIKE ALAN C=WE OWE HIM=MORE THAN ANY OF YOU CAN IMAGIN...