To clarify on Eyeball Collection, you still get a stack on assist - takedowns are both kills and assists. Now you gain the same amount for killing or assisting, and the max amount needed is reduced.
Edit: I can see now that it looks like it reads that Zombie Ward and Ghost Poro stack infinitely - that's not the case, both of them only stack up to 10 just like Eyeball Collection. The total Adaptive you gain from each of them is the exact same.