Say I didn't put any gasket maker between the rotor case and the rotor plate... what issues could arise?

Loss of boost and vacuum leaks. Random vacuum leaks based on engine temperature, as the case expands and contracts.

Oops, eh?

More of a "dammit i'm tired and hungry i need to be done"...

And I didn't think of it till just now.

Ooopsie

seams you made the misstake that i ALMOST made.. glad i stoped to think before i got to far ahead of myself. for whats its worth id not worry to much of the cost of another tube of sealer and just redo that part