Guild McCommunist said:
You mean get someone else's account on your Xbox, download the game, and then play it on your own? Yeah, that won't work.
For starters when you recover your account you need the e-mail and password you choose to register it. Secondly, even if you do get the account on your Xbox and redownload all the games, you can't just go to your account and play them. They need to be owned by your account.
My friend tried it with Dead Rising: Case Zero and it didn't work.
Weird, works like that on mine. I recovered a friend of mines from school Gamertag, and redownloaded all his Halo 3 DLC to my HDD. The I logged into my account, and played with his DLC. I haven't tried games, though I bet if you redownload one to your HDD, you could play it offline, while your friend recovers his account.