Replacement - Jason
Jason didn't honestly know why he still called Tim "Replacement." They'd been getting along—he actually liked the kid, despite his expectations—and Tim had been replaced as Robin himself (actually replaced, not just succeeded). And now that he was thinking clearly again, he could see things from Dick's point of view a little more, at least enough to realize that he himself had been the original "Replacement."
So the Replacement had a replacement and Jason was also a replacement.
Really, the whole family was a mess of replacements for the families they each had lost or wished they'd had.
Not much to add, just felt like showing Jason's point of view of the whole "replacement" thing and I am always a sucker for reconciliation between Jason and various Bats, so there you go.