Danny Elfman: question about his composing etc

[Synthpopbean]

Ok so I'm a big fan of Elfman and curious about a few things I read/heard. 

He's mentioned in various interviews that people in the industry, at least back in the day, used to rumor that he didnt write his own scores and had ghostwriters? Or maybe meant orchestrating it? Because he had no formal training and came from a rock band, etc. 

I'm confused now as to what this was all about? I thought he wrote all his scores but I have no idea how the world of orchestrating/conducting/composing goes in terms of this stuff. Can someone help enlighten me?

 

I attached an interview where he talks about this below: