I don't think it was ever any more than testing the water, or somewhere to put some his stuff that either wasn't deemed good enough, or "right" for Queen. Much the same as Roger did before him.
The story goes, that the main reason he got Jim Beach to canvass other record companies for Mr Bad Guy, and settle on CBS, was that EMI wanted to promote him as "Freddie Mercury - Lead singer of Queen", and the sheer fact EMI wanted the name Queen anywhere near his solo product, fucked him off SO much, he made up his mind that they weren't getting it.
What is left of your dream?
Just the words on your stone.
A man who learnt how to teach,
But forgot how to learn.