I wonder if Danny and Brad will decide to keep it low key and basketball focused, and go alone. It could send the wrong message (like "do they really care that much if only these two came"), but it could also just keep the meeting focused on basketball, which is important. I could see Danny starting off, saying a bit about how the team has done, the players we have, and the assets we can use to get others, then handing off to Brad for a really detailed run down of how Durant would fit in. I could even see Danny/Brad having proposed deals/fits for players Durant likes.
Either that or go for the "be a legend" pitch and invite Tommy and Bill