You chicken people are crazy... not just you guys, but the ones over the years that named these colors.... this rooster is clearly not blue.... OR grey which is what people call blue..... he may carry blue genetics, but he's clearly red... I have no hope of ever figuring out chicken colors... horses are so much more simple...
Haha! Fun aside, the hobby does have problems with naming. Several different names for the same thing(a gene, a pattern etc).. same name given to totally different things.
In the case of blue, look at it as the bird having the blue gene. That beautiful copper roo is Blue because his tail is grey, which indicates the presence of the blue gene.
The blue gene is good at diluting black pigments to grey shades. It has no or little effect on red/gold pigments. This is a nice feature enabling us to create and play with things like blue tailed reds, blue laced reds etc.
Solid blues are simply a solid black chicken with the blue gene.