Guys, the CoC mantled Sheogorath, and became him. To know what mantling is, in short, you act like them to the T, it becomes impossible to tell who is who apart. If it walks like Sheogorath, talks like Sheogorath, smells like Sheogorath, and quacks like Sheogorath, it must be Sheogorath. Also, mantling is not something new, Tiber became Talos through this by mimicking the enantiomorph of the Rebel-King, and became the new stand-in for Shezarr, Talos.
In short, Sheogorath will still be Sheogorath.