Marcellust
I don't want to sound like an a** here, but your whole argument is based upon your opinions on the types of bendings. What if psychic waterbending was a lot greater than bloodbending? What if Ming Hua was a lost cousin of Noatak's? Your rebuttal consists of your opinion, and nothing else. As I've said, why don't we wait until the season ends and we get to know the four of them on a deeper level and then we compare them to Noatak? It's like comparing a five year old who probably has many unknown potentials which he will unlock when he grows up to a young adult who has a developed prefrontal cortex and has an idea of what's right and what's morally just.
Uh... huh... I am pretty sure Noatak is a "psychic bender", and does it with Bloodbending. Remember, when he walked up to Tarrlok, and just, resisted with counter bloodbending at will, not even a flick of a finger, just, strolled up to Tarrlok like it was nothing, and took his bending away. If he seriously can't take out those four, he isn't that great. He only got bested by Mako because he underestimated him, same with Korra. He lost his composure and his confidence when seeing her Airbend. I think if he went all out, and didn't underestimate anything they could do, he would take them out.
But yes, I will wait for possible back story on the Red Lotus, how they came about, and such. How they gained their abilities, all that. But I still think, from current fights, maybe only Ming-Hua might stand a chance if she knows Bloodbending, but I doubt it. Just because she can bend without arms (honestly, why is everything thinking he is PSYCHIC? I do not get it, it's all in the head when it comes to your limitation of bending. She got over what ever limitation she thought she had when she lost her arms, thinking some bullshit that she needed to wave them around to do Waterbending).... doesn't mean she can bloodbend.
Also, I hate how everyone keeps saying Kya lost to Zaheer, when he just got lucky really, and he ran off, before anything went wrong. I honestly think Kya was even with him. Remember this, it took Zuko, Sokka, Tonraq and Tenzin to take down the Red Lotus Four. Obviously Zaheer didn't have his Airbending then, but, still, it took Tonraq, a skilled Waterbender, who was the original heir to the Northern Water Tribe. Tenzin, now the master Airbender after 5-6 years. Zuko, The Firelord who was trained by Dragons, BUT, would have been about 75, same with Sokka, a normal non-bender, who was a skilled warrior, but was also around 74. Tenzin and Tonraq were young, still had fit youthful bodies, while Zuko and Sokka may have been past their prime, though Zuko seems pretty fit still, but that could because Firelords seem to reach 90-100 years old.
I factor in many things in my thoughts, and I think Noatak, would beat them hands down, literally.