The guy searching for the headstone in Shane's office who killed himself has put another player into play;Stefan suggested there was a third party interested in raising Silas. Who is that 3rd party?
Possible and realistic options
1. The 4 hunters(sans Jeremy)
2.Werewolves( Hayley leading them)
3. Kol (plausible but now irrelevant he was the only person other than Rebecca who knew of the headstone)