Addendae do not need to be updated if nothing has changed, for example, you might be asked to sign a "lead disclosure addendum", if the apartment still has no lead, the document would be fine--it's not a contract only a disclosure...I agree it would be better to have your own, but in fact it's for landlord compliance and your information. If both were accomplished, then it should be fine.
Part of your question I blame on our public school system, so I will not attempt to determine what you meant when you said, "no im going to court bc my other roommate-" but yes, your signature does count. So if you signed something it means you agreed to the document you signed.
Is that responsive?
Broker in NH