This - if you find a crazy spotted rooster it's easier to spread those spotty genes to non-spotted breeds like NHR.
However - the roosters seem to show less white than the hens, just in general! So finding a rooster with that much white is VERY unusual.
If you Google "Speckled Sussex Rooster" please note in particular the amount of white on the neck feathers of this Ebay guy.
Here is a very minimal spotted boy:
And here is a boy with a fabulous spotty chest, but now compare his almost totally dark neck to the Ebay auction roo:
So it's the spotty neck in particular that is unusual.
I wish the hens showed MORE white though!
Here is one other boy I came across on Google that has some white on the neck and head areas:
And just for fun, here's a really cute hen:
I wish I had the time / money to raise a flock of 25 or 50 hatchery SSX to 4 months just to pick out the most spotty and sell the rest. Kind of hard to plan for that, the Sussex from Meyer and Ideal tend to sell out fast, so you have to order WAY back in October. I could have done it this Spring but I wasn't sure. I do like to travel which makes it challenging to plan a batch of chicks six months in advance. It's easier with hatching my own. Eggs hatch in only 3 weeks, and if something comes up, I can always sell the peeps and try again later. Would hate to abandon an order of Sussex, but committing to four months and a dedicated area to raise that many peeps to almost point of lay is daunting! (Even though I know the extra Sussex pullets would sell great out here,.)
Oh well, some day I'll do that, and see what kind of variety is seen in the hens.