I'm not sure, are you talking to me or to those on the thread who suggested IXXX?
I thought INTP could make sense, but that's because I picked up on Ti and Ne. I do think ESTP really does fit Louis well, but overall, I think ENTP is the better fit .... based on a wide variety of interviews over the years, watching his TV shows/specials, and having seen his directorial effort in Pootie Tang. Also, ESTPs I know aren't as weird as ENTPs can be. Both ESTP and ENTP are quick, clever, witty, as well as loud and obnoxious, but it just looks and feels different when you see those behaviours between the two types. For me, it comes down to does someone's overall thing fit NT or SP. In Louis CK's situation, as far as I can tell, he fits the NT profile via ENTP.
As for the loud and obnoxious: can you point me to something specific, like youtube videos? Because Ne-Ti obnoxiousness is different from Se-Ti.
Edit: I'd probably still be on the ESTP train if I hadn't seen his Louie series on FX. It contains some of the most genuinely weird, offbeat, and strange moments. While I do see the Se-dom argument, I think most standup comedians learn to use Se, since they're always scanning the environment for details to incorporate into their act. Even if they're bolstering a concept, they'll pull concrete details so that when they're telling the story we can form an image in our own minds.