I had fun doing this but cannot see two of the answers completely. 11D is clued:- "Like the relationship between Dan and Benjamin." I can only
see "INTERTRIBAL" as the answer. I imagine it has something to do with Dan Benjamin, the entrepreneur, but I cannot see why.
The other slight mystery relates to 16A which is clued:- "Burden notedly subject to variation." The answer should be "THEME" but I cannot link up the word "burden" with the answer.