So you have one pen of Chocolate
Silver-laced Orpingtons and one pen of Lavender-laced and Mottled Orpingtons? Are the Lavender-laced Isabel Lavender-laced (Gold-laced with Lavender gene) or Lavender Silver-laced (Silver-laced with Lavender gene)? Are the Mottled birds Black Mottled? Lavender Mottled?
I don't breed Chocolate Silver-laced because I don't like them visually, but I'd think this little one is Chocolate Silver-laced.
The other chicks appear to be Black Mottled, although if they also have Laced parentage, all I can say is that they came from that pen. I could play in the Genetics Calculator to show you the possibilities if I know what's actually in that pen.
Do you have pics of the parents?