Since these all likely aren't from the same parents, I think there is a chance that these particular two in question were from the saxony, and the rest could be purebred rouens. Or these two could be runner crosses and the others still purebred rouen. We'll have to wait for Welshies to get more...
I think there's a little confusion in here that's contributing to not being able to identify the breed for sure. Were these hatched four weeks after the saxony died, or were they laid four weeks after the saxony died? You've said both in this thread. I think clearing that up will help. At any...