The only reason I could think of not sending is if the royal commission has a surprise subpoena. Which I seriously doubt. I imagine these things take months to put together. Even if it jeopardized there subpoena I still think it's worth it. The news coverage of a jw leader dodging the press would be priceless.
I also wonder of Jackson could be the next Ray Franz. I admit that I don't know him well but he seems to be a genuine true believer. Not one that puts on a show like Lett or Morris.