Any alien should be able to teamkill a marked buildable and have the points return to the que instantly, or that's how I understand it. However, I have found (and this is easy to test) that the building's points do NOT return properly unless the building is marked
after it has been destroyed and starts to shrink. I'm sure this isn't what was intended. It means that a granger must still be present every time a structure is tk'd so that the points return. To test it now, just log into an empty match and grab a granger. Build a bunch so you know how many points you should have left over. Now mark a building, and kill it. The points won't return. Now go to another building and kill it. Don't mark it till it's HP goes to zero, however. You will notice now that those points will enter the que immediately, in the proper fashion.
Just think of how many matches we've lost so far, cus we thought we were doing it right

1.2, obviously.