The pwm 4pin wire attached to the pump goes to the cpu_fan header. If you pump also has pwn fan connectors, that's where you plug the aio fans to.
If you plug the aio fans into the hub (a viable option) the aio fans will be controlled by wherever/whatever the hub is controlled/plugged into. So if the hub is using a case/sys_fan header, you cpu temps will be controlled by your case temps (not a good thing at all since case temps only usually range from 30-40°C). Meaning if your cpu reaches 50°C +, your aio fans will still be spinning at 30 something %, if it reaches 70°C, they'll still be spinning at 30 something %.