It appears I may have triplets! The large piece that had remained seems like it might be growing into two anemones, which would give me a total of three RBTA's!!! Holy cow! I'll have to see what the heck I'm going to do with them all... Would be kind of cool to have a massive colony of RBTA's on one side of my tank!
False alarm; only two anemones, the "third one" was the result of the main RBTA trying to grow back together. All is well now. For the time being, I'm keeping both. However, should the small one get huge, it will have to go. If that time comes, I'll let everyone know and it will go to the "high bidder."