While that sounds good in theory, I have to disagree with pump AND fans on the same header UNLESS there's an alterior firm of fan control. There's very few aio pumps actually designed for variable speed control. Nzxt is the only Asetek pump that comes to mind, and it's a hybrid built by Asetek in conjunction with Nzxt, not a purely Asetek supplied pump. Coolit pumps are not designed for variable speeds either, the reason being that they are already such low pressure/low volume pumps that any deviance from a constant 12v supply has detrimental affects on both ability and longevity of the motor.
Pump can be on any header, if a 3pin, it must have fan control either bios set for 100% duty cycle, disabled fan control, of is using mobo software or SpeedFan, set for 100% constant. PWM does not affect voltage, so is always at 12v constant.
Fans can be on any other header. Corsair directions specify pump on cpu_fan and fans on sys_fan. Only because if the cpu_fan header tach reads 0rpm, it'll shut down the pc or refuse to boot, showing a cpu_fan error. Personally, I'm not a big proponent of that idea, most motherboard bios is too simplistic to seperate sensors from headers, which leaves pump running 100% (cpu_fan is a dedicated pwm header, no matter what mode is used for the sys_fans) and most case fans at the mercy of whichever sensor it's tied to. I've seen sensors that always run hot because they are parked next to the Northbridge or Sata controller chipsets and sensors that rarely change because they sit right above the psu. SpeedFan, HWInfo, Asus suite all report me having one sensor at -125°C and another at +255°C, not good for fan control at all.
So for me, pump goes on cpu_aux, cpu_pump, or adjusted sys_fan or even direct to psu, and fans go to cpu_fan. The only exception is higher-end aios where fans are directly connected to the pump housing and controlled by software via usb/Sata, which leaves the pump/fans powered by Sata, controlled by software and pump tach on cpu_fan to avoid cpu_fan error.
Regardless of vendor directions, there really is no right or wrong way to hook up an aio. There's only what works and what doesn't, for you personally. I've seen plenty of ppl not use usb and software control (corsair link had more bugs than an anthill for many years), so put a splitter on cpu_fan with the fans, and pump went to cpu_aux or other. Same hookup as a basic aio, using bios settings. It's not wrong to do it that way, it's just not what the vendor envisioned in design, and it's not what they prefer since the chances of pump failure are higher than fan failure.
Of course I ran my aios 24/7, 360 days a year, for over 6 years, shutdown only to clean, and wouldn't you know the first and only thing to fail was a fan.