Walker Class: Output Parent Description and Featured Image right after sub-menu?

Figured it out as I wrote out my question. Love when that happens. Here is the solution if someone needs this for the future. I simply just wrapped the desired output in a conditional to match the depth I needed. Viola>

if ( 0 == $depth ) {
     $item_output .= "\n$indent<div class=\"dropdown\"><div class=\"container\"><div class=\"thumbnail\">".$thumbnail."</div><div class=\"nav-info\">" . $item->description . "</div>\n";
 }

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