You suspect wrong, according to
wiki the big bad is named Rowan and played by Neil Casey.
Although Aykroyd, Hudson, Weaver, Potts, Murray... and Ozzy
will have cameos.
And believe it or not, I only just realized that my favourite actor (Dan Aykroyd) has two Ys in his name
I really thought his name was Akroyd.
For years I had a Blues Brothers poster right above my bed... how could I not see this?