I don't consider one anecdotal example to be even close to proving that.
I could offer lots of anecdotal examples where I pulled a guy down the same cycle as someone else and it didn't cost me any more than expected. Under your theory, the fact that the other team was also actively pursuing him should've made it more difficult.
I would be totally shocked if the mechanism was that sophisticated. I'm so confident, I'd bet a considerable GC on it, though I don't know if we could ever get a straight enough, reliable enough answer to really settle it.
