And the fact that the 7 fans all spin at around 800 - 1000 RPM should also require less power right? Because the Wattage requirement for the motor is lower.
Even if the fan is spinning faster, it may have a less aggressive blade profile that moves less air.
The less work the fan does, the less power it needs.
When a fan is started, it must overcome the inertia of its moving parts and may draw more power than its rating. This is "start-up-surge".
Watts is watts, the fans draw their rated draw (unless you're running them above or below their specified RPM or are measuring starting power).
CFM, on the other hand, is a flow-rate and is a better indicator of the amount of work being done.
Anyway, just connect all the fans to that splitter, connect that to a single 4-pin Molex and be done with it. You will need an adapter for that splitter or get a splitter terminated for 4-pin Molex.