Haha I could never tell. As I was reading it I was thinking, "I'm going to ask if there's a wrestling background going on."
The only one in your list that I would consider for a Top Fighter list is Henderson, for the very reason you said. He scoffs at the idea of weight classes:
Sonnen isn't a favourite of mine, but I do like him... BUT P4P best trash talker in the game, bar none. It's poetry. I saw you had a quote of his in your sig, one of my favourite moments is "I think a black belt from the Nogueira Brothers is kind of like getting a toy in your happy meal." For the record, I love the Nogs, but this is just funny as hell, and clever.
I'm going to try to narrow mine down but it's hard because there are so many fighters that can make the cut:
Nick Diaz - My favourite, because he's entertaining. He fights, he's a BJJ guy who goes in there and punches.
Katsunori Kikuno - Another thrilling fighter. Interesting style, with a different stance, plus he fights you with a creepy as hell smile on his face.
Kazushi Sakuraba - Way way way past his prime, but one of my favourite fighters ever. A legend.
Shogun - Violent, arguably the greatest LHW of all time. But sadly, injuries have made him very inconsistent the last while.
Alexander Sarnavskiy - I think he's a good prospect with a fun style.
Fedor Emelianenko - Legend. Always goes for the fucking kill, regardless. Fears nothing.
Gegard Mousasi - I don't get the hate on him. The way he fights isn't exactly good with the AMERICAN style of judging, but he's still very talented.
Shinya Aoki - Sometimes a piss poor attitude, but a submission whiz.
Kazuki Miyata - SLAMS! GERMAN SUPLEXES!
Megumi Fuji - In my eyes she's still undefeated. Got robbed. Another submission whiz.
Genki Sudo - I throw hiim in here even though he's retired, because he's probably the most entertaining fighter to ever fight. Big spins, crazy combos, eccentric attitude with a positive mentality. "We are all one."
I think those are my favourite right now.. some honourable mentions because I'm bad for that:
The Mongolian Wolf, Minowaman, Takanori Gomi, Hatsu Hioki, Rampage, Big Nog, Melvin Mahoef. Magomed Shikhshabekov, Mamed Khalidov. Then a bunch of people who look promising but I haven't seen many fights.
Not a whole lot of people with a wrestling base, so we're different, haha