I will reply to the splash egg color question
In my past experience the splash are more likely to have lighter egg color... It is more difficult to get the darkest shades of eggs from this color... There is such a complex set of genes that govern egg color and melaniser that some speculate that the melaniser that drives the colors on the outside are linked to the genetic "drivers" that regulate the egg color as well. As we separate the genes and weed out all the colors that make up the BCM such as hidden wheaton, birchen, BTB, Blue, Splash etc... you find the loss of color initially... I find that concept interesting. My darkest layers to date contained all of these host colors in their makeup.... when broken down genetically by weeding out certain color the egg color was lost almost entirely... this being show most prominently in the Splash and the Birchen....