@oristarA,
I've been playin around with this topic, Oris, but I'll play it straight for a minute and try to explain my thinking (which may be wrong, but...).
1. obsequious is basically a character trait, it's an adjective.
2. A toady is a type of person. It's basically a noun
3. minion is a relational term between two parties.
Standing alone it wouldn't make much sense for me to say something like: "He is taller." You would immediately ask "taller than what?" Same with minion--whose minion?
So basically I'm talking about an obsequious toady (which are similar, maybe, but not strictly synonymous). A toady is generally obsequious too so you could say it's redundant, but strictly speaking it isn't.
But this obsequious toady I'm talking about is also on the subservient end of a relationship that I want to disclose. So it's an obsequious toady who happens to be a minion of Blather. One of his minions, who also happens to be an obsequious toady.
To me that comes out as an obsequious toady minion (of Blather's).