Need some help with a bottom up recursive query

I need to query some hierarchical data. I've written a recursive query that allows me to examine a parent and all it's related children using an adjacency data model. The scenario is to allow users to track how columns are populated in an ETL process. I've
set up the sample data so that there are two paths:
1. col1 -> col2 -> col3 -> col6
2. col4 - > col5
You can input a column name and get everything from that point downstream. The problem is, you need to be able to start at the bottom and work your way up. Basically, you should be able to put in col6 and see how the data got from col1 to col6. I'm not sure
if it's a matter of rewriting the query or changing the schema to invert the relationships. Any input is welcome. Sample code below.
DECLARE @table_loads TABLE (column_id INT, parent_id INT, table_name VARCHAR(25), column_name VARCHAR(25))
DECLARE @column_name VARCHAR(10)
INSERT INTO @table_loads(column_id, parent_id, table_name, column_name)
SELECT 1,NULL,'table1','col1'
UNION ALL
SELECT 2,1,'table2','col2'
UNION ALL
SELECT 3,2,'table3','col3'
UNION ALL
SELECT 4,NULL,'table4','col4'
UNION ALL
SELECT 5,4,'table5','col5'
UNION ALL
SELECT 6,3,'table6','col6'
SELECT * FROM @table_loads
SET @column_name = 'col1'
WITH load_order(column_id, parent_id,table_name, column_name)
AS(
SELECT column_id, parent_id,table_name, column_name
FROM @table_loads
WHERE column_name = @column_name
UNION ALL
SELECT tl.column_id, tl.parent_id, tl.table_name, tl.column_name
FROM load_order lo
JOIN @table_loads tl
ON lo.column_id = tl.parent_id
SELECT * FROM load_order

Got it. It required a VERY subtle change in the join code:
WITH load_order(column_id, parent_id,table_name, column_name)
AS(
SELECT column_id, parent_id,table_name, column_name
FROM @table_loads
WHERE column_name = @column_name
UNION ALL
SELECT tl.column_id, tl.parent_id, tl.table_name, tl.column_name
FROM @table_loads tl
JOIN load_order lo
ON lo.parent_id = tl.column_id
SELECT * FROM load_order

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