Interesting you should mention the straight comb. While observing my silkie babies today, I noticed 3 of the six have what appears to be a straight comb. I thought it was odd. I did purchase them from TSC so I know they are not of show quality. They are only 2.5 weeks old. I don't know if the comb will change.or not.
Unfortunately, it will not change. But, unless you plan on showing, its no biggie