How to determine if a Username is going to be Recycled

  1. Thats not claiming the account.

Thats agreeing with the account owner to transfer it to you

  1. Thats a possible route but usually falls under the Trademark parts for just taking an account.

Your original post is about the termination and recycling of an account that is unused. Not about how to acquire ownership of an account that is not yours which is totally different.