My interpretations of your questions .. and as we all know, my and everyone's view of the world is different :-).
What does natural mean to you? a Natural is the guy that has no concept of game, no concept of the rules and everything he does, he has just adapted and learned since he was a small boy. Natural game is taking what the Natural guy does and apply that.
Do you consider natural the route to take? No.. I am not a natural.. I missed all the stuff that a proper natural developed while at school as i was the Geeky kid. I'm very logical and process minded so i'm better off taking chunks of what works (be it MM, Style, David D) and applying those bits as well as expanding and becoming the best Retro i can be. Also the "hey i'm tim, i thought you were cute i just had to meet you", i still think you have more of an advantage if you are reasonably good looking, where as micro managing the situation you have more of a chance of flipping the attraction switch.
Advantages and disadvantages? See the bit above.
What the stages of being a natural are? Not sure.. Surly being "natural" would not have stages as such, as if it did have a stage then its no long natural as your working to a process which is back to MM again. I think being natural is more the attitude, so a natural i watch at work (no idea of
PUA at all), is cheeky when he's talking to women, not afraid of stating the intent that he wants her, very self confident.. the other interesting trait they seem to have is they are aware of female body language at a subconscious level (back to learning when they were young and growing up at school) and can spot if someone is interested in them before the initial approach. I am particularly interest in the latter myself and have read a great book call 'Under cover sex secrets' which is all about women's body language when trying to attract a mate and I'm in the middle of watching a 4 dvd set of David D's about body language.
And finally the type of game you use? A bit of everything. I have my magic tricks, Styles ring finger routine, the cube, mix in a bit of cocky funny, drop in a bit of juggler SOI, and a bit of natural "hey lets Salsa", and thats what i'm running with. But i dont know what really works yet so lets nick the phrase out of the move hitch "you is a very fluid concept right now", meaning me :-)
I personally don't think you should worry Jynx.. you've got a lot of the quality's of a natural already (being fearless, confident can add that cheekyness into a conversation) but with the added bonus of knowing about game.
Retro