I came to the exact same conclusion several threads ago. For reasons unknown, he stubbornly refuses to follow convention block wiring because he feels his way is better. If Sux would have followed my schematic or others, he would have been done weeks ago. 
Or he could have used toggles in place of the selector. Either way if you want to isolate sidings, yards and have 2 power pack control that is how you do it.
Buy a book Sux and start running trains instead of shuffling terminal blocks.