Well... I see this is still unanswered, so I'll give it my best shot.
The cockerel does look
similar to crele, but I don't think he actually is one. There's something off about his red patterning that's not quite right for a true crele. He also appears to be single-factor barred instead of being pure for the barring gene as crele should be. I can't tell from the pictures if he's actually diluted to blue or if it's just the barring making his black markings look paler, but I'm guessing based on what you said in the post that he's actually diluted? Do you have any pictures of him as a chick, especially ones showing his back?
Being that Whitings are effectively a multi-generational selective mix and not really a pure breed, it's pretty tough to predict what their offspring will look like. It's very likely they're heterozygous for a lot of genes, and they could be hiding recessives that would throw a wrench into any predictions based solely on appearance. For example, the solid blue female, were she
pure for that appearance, I would expect to produce blue and black (and splash if the male is actually blue diluted) chicks with some color leakage, both barred and not, when crossed to your cockerel. However, unicolor black (and dilutions of it like blue) are dominant over plumage patterns, and, since she as a Whiting has a mixed heritage, she could be hiding other pattern genes like duckwing or partridge that might pop up when bred to that rooster. So my best guess on their offspring is that you'd get a mix of birds that resemble the birds you're hatching them out of, maybe with more or less color on them.