I see that some of the runs have igt, some of them(including mine+friend) has rta. Which should we use and if igt is the answer, is there autosplitter for mw3?

The is indeed an autosplitter file, I'm not sure why this game doesn't have igt along with rta time, i couldn't find out how to change it, but i should.

Here is the autosplitter file https://www.dropbox.com/s/d2580h2rict6ble/mw3.asl?dl=0

I fixed the issue with the game/real time not showing up, didn't realize this was broken thanks for bringing it up.