HEChicken, I love that you are doing more research. Keep it up!
I did try an experiment last year to try and see who contributes more to size - the hen or rooster? It also was hopefully to help us learn more about how strong the Mahogany color in the Sussex was, and whether it can be overcome in just one generation.
So we took a buff barred, small gamey Aloha rooster, and crossed him to big, fat, plump spotty Meyer Sussex hens. And then, go figure, the second we get the pen set up for two weeks and start collecting eggs, the heat came on and the hens STOPPED LAYING. Arrrrgh! So I think we got only eight total eggs for the entire week? (Out of FIVE hens!!!)
Notinoz hatched the eggs, and I wasn't going to insist on her keeping the roos as that was not a cross for roos anyway! The result was only two hen. Both were small-ish, and one was really dark in color. So the size of the hen did not magically make the chicks bigger! It was a small test group however, so not really a good scientific survey. At least we tried! She kept the dark hen, who is actually kind of cool. It might be fun to see if she ever has bigger chicks someday, if crossed to another big rooster. Will the fact she is 1/2 "big chicken" show in HER babies? Hmmm!
Then, I crossed my small Aloha hens with the tall Swedish rooster. The chicks ended up in-between sizes. But yes, there was a very noticeable improvement in size on the first generation cross between large Swedish roo and small Aloha hens. So from this very small, very un-scientific study, I'm leaning towards the rooster having more influence on size.
As for amount of spotting or color . . . . ??????? In this test case, the hens were all dark and the roo was light, but the hen that Notinoz kept was extremely dark! Weird. Unpredictable Alohas!!!