will this work

if i could recover someones account with map pack 3 on it and i could download it?

 

yes it would i tryed it before...

 

But you could only access the map pack from that account and not another one on your system, unless you are the original downloader of the map pack and then you could play it on every account on the console.

 

yea it would work. you don't have to be on the same account so have the map pack 3 come to your own account.