She looks kinda like a blue paint to me. They do look similar to splash. So it is very possible the White Silkie could have been the father before he passed.
Myth. This myth has been circulating for along time. Only dangerous Gamefowl is a Man-Fighter. It's a genetic trait that's is a direct cull, & shall never be bred forward. It exists in normal fowl as well, but more often in farm Chickens, then Gamefowl.
Okay? Indio Gigantes would be some pretty consistent looking mutts, if they were truly mutts.
Like all breeds, every breed start as a cross, before they're used in selective breeding for keeping, & eliminating unwanted traits in order to make a breed.