I like your thinking here. Maybe the Negan we are seeing isn't the actual leader. Maybe he's just a sergeant and there's some actual general that we haven't seen yet. Works with the whole "we are Negan" ideology.
I think he's got to be the real Negan though. If he knew it was only a matter of time before he got sniped, he wouldn't dare leave himself so wide-open and vulnerable. This has got to be the one real Negan. His ego is so enormous (it's YUGE), and based on previous experience, no one's bothered to kill him yet, so why should he worry. Why indeed.
This is of course totally unrealistic. No one this smart is simultaneously this stupid, and this is what really bothers me about this story. Narcissist or not, nobody is this dumb........ are they??? It's only a matter of time before he gets popped. But then I hear spoilers from others who've read the comics....... and it just makes me think the whole thing is even dumber yet. I hope we find out sooner than later as this is all going to become tedious if it continues on the current snail's pace.