Hi Kwik, Your Graycie reminds me a lot of my Bob (the) Cat. He was a random stray listed as domestic shorthair but looks very much the similar. Bob who just turned one year old, unlike your Graycie is quite bold, he likes to howl when he really wants something.
Looks a lot like Bob, he had what looked like tabby markings when he was a small kitten. The other pictures are him at around 9 months and those markings are gone. Apart from some slightly dark stripes on his tail.
Bob was a foster that I tried out with my older cat to see how they'd do, they did and do very well together. This is one of the earliest pictures I'd taken of him at about 5 weeks old.
A new addition three months ago is a small grey kitten I got at about a month old. He's now four months old and turned into my shadow. Really nice, sharp kitten and likes to play fetch.