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CARLSBAD, CA — For most of their D conference interviews, Kara Swisher and Walt Mossberg trade off interview duties. But why was Mossberg the one to do the D6 interview with Yahoo CEO Jerry Yang and president Sue Decker? Swisher frequently covers Yahoo in her AllThingsD.com blog; I can't think of the last time Mossberg has typed the letters "y-a-h-o-o" in his gadget reviews. Here's my theory: Decker and Yang agreed to speak at D6, but only if Mossberg was the interviewer, not Swisher. Then Swisher tweaked them by asking a question — not on stage, but on video. If so, serves Yang and Decker right for not nailing down all the conditions. Think they'll be having words with Yahoo flack Jill Nash afterwards? (Photo by Asa Mathat/AllThingsD.com)