Ok in gears when searching for a game you will never play with some one unless they have the same dlc which comes in really handy when you dont want your money wasted
I think halo reach sould be updated for the ability to turn on and off a function like this
This way we can play the dlc which was a waste of money and actually play it making it so that waste of money was a well spent deal
Ex.
you go to match making
click on the party settings
then Check Only allow DLC
This will only allow you to play with people who have the dlc you have on match making
and bam your now playing on break point in invasion