Ah, but the "fun" bit here is that David and I have a bit of a history..
We were both on a "game designers" e-mail distribution list back in 2002? I was bouncing around ideas for a fighting game in develpoment (which became Godzilla: Destroy All Monsters Melee on GC and Xbox), and David was... not kind about my concepts. One of which was - I wanted to simplify the inputs, so that there was zero complexity in the execution of the moves - allowing focus on just the tactical differences between the kaiju mashups.
Then we had like a decade of very little interaction, but our occasional brushes were still somewhat tense.
And then, about 5 years ago, I had a board game publication with Game Salute, who was also publishing a new Sirlin games game... and they ended up cutting about 30% of their slate, including my game but NOT including David's game. Grrr...
So we've had a bit of a checkered past. Though you could also say that we've had like 6 brief conversations, and none of them of real weight, so it's a bit of a stretch to read much into it.
Plus, 2-3 years ago we randomly sat next to one another at a GDC talk, and I took a moment to clear the air. So our most recent chat was personable, at least.