@XHelperZOh man, so I unlinked the other account this account from my main Steam account, the other this account has all of my heirlooms, and my main account (kuinemuH) has all of my season 1-2 progress and is now linked to my main Steam account. I tried to link the other this account to a different Steam account, but it's unable to as you can only link to one Steam account in an EA account's lifetime. Am I just going to need to wait 6 months to re-link the account? Or am I boned and now have an impossible-to-use account with 5+ heirlooms?
Massive oversight on my part.