^^ This is the first mention of making canna oil here, I'm not sure what rumor you are talking about.
As I said, I have and do use the remains to do a second extraction and make two different hash oil qualities.
Canna oil is going to dominate the taste of your product, if you don't mind a dark green butter that taste extremely bitter yes you can make canna oil edibles from your remains (however I doubt anyone will claim they have done this here). Just make sure you properly dry the iso off of the bud before you mix it in with the butter. They will be weak, probably taste bad, but it will work.
Edit:
Also, this is assuming a 10 second wash. If you do only one wash with 3 minutes, you are likely to take almost EVERYTHING out of that damn plant.