Well 75% Of the time they dont delete the bronze player's leaving you with there team name
Then with any luck they have uploaded a goal/screenshot with their ultimate team.This allow's you to search for their team name and you will find a video of a goal they have uploaded to the ea website so then you go on http://www.ea.com/soccer/ and search their team name and then it has their Gamertag there.Then you have their Gamertag add them read the bio if it give's you any hint's even better but even if it doesn't ring up ea and tell them how you found out it was them.
Jack said:No you can do it with any occasion ie. trading to tell the person you have offered that is what i use it for as long as your on your xbox it come's up the person you bought it of if it still has the green ring around it.
I could of done a 10x better tut but i am rushing when i get home on Monday i will take my time and make a easy tut to understand etc using my xbox and my laptop.You cant do this on the web app i think not.
Source Don't go crazy because it's off TTG.
I personally don't know how it works unless you look at it while they're doing it. But he says he's going to upload a better video on Monday so I'll keep it updated.