CF9 ormsetting dialect

I was just wondering why you need to specify a dialect in ORM, if you define this in your datasource?

Example:
Application.cfc
this.ormSettings = { datasource="jbankenBlogspot",dialect="MySQLwithInnoDB" };

I shouldn't have to specify dialect="MySQLwithInnoDB" if I did it already in my datasource. Maybe I am missing something here.

The real hard part is that hibernate was throwing an error that was the same as if you had a bad path to your entity cfc.