That's definitely an interesting theory. It would fit in with the fact mentioned in one of the articles about a recent age progressed image that was created of Brittanee. If they had found her remains, why would they be about to release this new image? The only reason I can think why that is relevant would be if they believe she is still alive. The quote below seems to say
that she has been identified, or is it just inaccurate writing?
From the link provided earlier:
'Lt. Joey Crosby, with Myrtle Beach Police Department, said in April the case remains wide open, and
they have used age progression to identify Drexel. "
https://stephww.wordpress.com/2016/06/03/breaking-news-in-brittanee-drexel-dissapearance/