TSC stores can get their chicks from three different hatcheries. I have no idea which hatchery your chickens came from. Different hatcheries offer different breeds and they also offer different mixes. With the recent surge in popularity of backyard chickens many hatcheries have started creating their own mixes and give them marketing names. They aren't all breeds for sure and a grey color is trendy. Your grey is more likely a mix than a breed but who knows. It could be a "blue" or a "lavender" of some breed.
There is a lot more to breed than just feather color/pattern and comb type. I agree Mottled Java is a good guess for your black and white one. You might look through this link to see what some of those are for a Java and see how your hen compares,
https://livestockconservancy.org/heritage-breeds/heritage-breeds-list/java-chicken/
As for people hating on
TSC. When I go to a certain fast food chain for a hamburger I sometimes get good service and quality and I sometimes don't. The difference is in the personnel. The same is true for any farm store chain. They all have different personnel in the different stores. Don't let people guilt you because you got your chicks from a
TSC just because it is a
TSC. And no, I do not own stock in
TSC.
There are a lot of myths out there about EE's. The original blue egg layers were discovered in Chile. In the same region of Chile they discovered a different type of chicken with a pea comb and feathers on the face. Different landraces of chickens but the origin story was really mixed up by the time they made it to Europe. All blue/green egg laying breeds were developed from this barnyard mix of chickens that originated in Chile and many have characteristics of those other chickens.
The Auracana and Ameraucana breeds were developed in the USA from the original EE's. The Ameraucana were developed and recognized as a breed in the 1970's. I can't remember when the Auracana were recognized but it wasn't much before that. You can make EE's by crossing Ameraucana or Auracana with other breeds or barnyard mixes, many people do. But some of the hatcheries we buy from had their EE flocks before those breeds were recognized. They could not have created their EE flocks by using either of those breeds because those breeds did not exist at that time.
There are a lot of different myths and stories about EE's. The truth is often more exciting than many of these myths. To me they are just chickens that can lay some really pretty eggs. Hope yours do.