I think we should map some more tables:

Magento 1                     || Magento 2
sales_flat_order                 sales_order
sales_flat_order_address         sales_order_address
sales_flat_order_grid            sales_order_grid
sales_flat_order_item            sales_order_item
sales_flat_order_payment         sales_order_item
sales_flat_order_status_history  sales_order_status_history

If we had the invoices and shipments, we need to map more tables.

Note: when we want to clear the order from Magento 2, we can use this module.

I think we should map some more tables:

Magento 1                     || Magento 2
sales_flat_order                 sales_order
sales_flat_order_address         sales_order_address
sales_flat_order_grid            sales_order_grid
sales_flat_order_item            sales_order_item
sales_flat_order_payment         sales_order_payment
sales_flat_order_status_history  sales_order_status_history

If we had the invoices and shipments, we need to map more tables.

Note: when we want to clear the order from Magento 2, we can use this module.