Besides, how do you have power and control BOTH be dictated by the main strings. Makes no sense.
The real breakdown (from my own scientific study) is:
Power: crosses
Spin: mains
Comfort: crosses
Control: mains
Feel: mains (can be subjective, as the crosses provide comfort, but the mains are longer and transmit more vibrations)
While I don't disagree with you, I would be wary of assigning one attribute to half the stringbed or the other. And I'm sure you realize this, and maybe simply meant, the "majority of x is from y", as in, the majority of power is from crosses, the majority of spin is from mains. Once you string up a hybrid or not, you still end up with *a stringbed*. Power, comfort & feel cannot simply come from one half or another.
Spin, for instance, is based on how the mains interact with the crosses. (see the COF stuff on TWU).
Control can't just be from mains, because if I take one racquet with Full Gut, then another with identical Gut Mains, and add Poly Crosses, I will increase control by swapping just the crosses.
Same with comfort. Take a full poly, then swap the mains for gut. You will most definitely have better comfort, but all you did was change the mains.
My point is we need to be careful in simplifying the complex nature of a stringbed into two unrelated halves, which is most likely not your point, but it comes across that way. Once you string them in a complete stringbed, you really cannot talk about one half as separate from the other, a hybrid is all about how each half INTERACTS with the other.
Just my opinion and experience.