I have never had an Icelandic with white legs. Not saying that it couldn't happen but why don't you think the cockerel is a Sulmtaler? He has a single comb and since you got pullets, it would seem that is a possibility. Here is a link to the Sulmtaler Breed Club page that talks about the Splash Wheaten and describes what it looks like.
http://www.sulmtalerusa.com/breed.html
Here is the cock that is in the lower right corner of the picture that you asked about. He was just over two years old at the time the photo was taken.

http://www.sulmtalerusa.com/breed.html
Here is the cock that is in the lower right corner of the picture that you asked about. He was just over two years old at the time the photo was taken.