That’s correct in many cases, wyandotte lacing tends to be more recessive, and you would have a better chance of getting lacing if you crossed the offspring together or offspring to Wyandotte
“Solid chocolate” is solid black with the chocolate gene
Dun can be found in polish bantams, old English game bantams (such as fawn duckwing), and seramas
Chocolate can be found in cochin bantams
Here are a couple examples of incomplete lacing: https://www.backyardchickens.com/threads/rhode-island-red-hen-x-gold-laced-wyandotte-roo.349906/post-18042126
https://www.chickenforum.com/posts/122934/
I would focus on barring and lacing first since your birds don’t have mottling. Crossing one of the barred offspring back to a Wyandotte should give you 50% barred chicks, and more laced/incomplete laced patterns than you’re seeing now.
I can see damaged feathers in the pictures, the feathers there do have a downy part, which is what you’re seeing since the top part of the feather is gone
None of the birds in the pictures are chocolate, the tan hue could be sun-bleaching or gold leakage (which is straw-colored on a lavender chicken). The chicks aren’t laced, they have buff leakage from the buff hens
His lighter barring isn’t because he’s a marans or Dominique cross, it’s because he has the blue gene (he’s blue barred), though I agree that he could be a marans mix
The left hen is lavender, the hen on the right is lavender mottled. Lavender (and mottling) are recessive, so lavenders will produce solid black chicks when crossed to a solid black chicken.