Make the dressing. In an upright blender, combine the cashews, chopped dill pickle, water, pickle brine, white wine vinegar, nutritional yeast, onion powder, garlic powder, agave nectar, salt, and pepper. Blend this mixture on high until smooth and creamy. Check the dressing for seasoning and adjust if necessary. Pour the dressing into a small bowl and stir in the dried dill weed. Set aside.
Make the toasted and seasoned breadcrumbs For topping the salad. Heat a medium skillet over medium heat. Pour in the olive oil and swirl it around. Add the breadcrumbs to the skillet. They should sizzle a bit. Give them a stir and then add the nutritional yeast, onion powder, dried dill weed, salt, and pepper. Once the breadcrumbs are starting to darken around the edges, lower the heat to medium-low. Keep stirring the breadcrumbs until they have dried out a bit and are evenly toasted, about 5 minutes. Remove the breadcrumbs from the heat and let them cool completely.
Assemble the salad. In a large bowl, combine kale, cabbage, romaine, and cauliflower. Pour the dressing over the vegetables and sprinkle with some salt and pepper. Using tongs, give the salad a thorough toss until all vegetables are coated in the dressing.
Top the salad with the toasted breadcrumbs and fresh dill (if using). Serve immediately!