I think you lost me
It is my impression that NC5 OTA can downgrade to MK2 without needing root access via Odin.
From there root MK2 and move up the process to prerooted NC5.
I'm pretty sure on that. Anybody can downgrade via surge's method, rooted/unrooted.
If I have helped please hit the thanks button!
Verizon Samsung Galaxy S4
Rom: [ROM] Eclipse S4 TW - v4.0.2 (6/25/14) - Real AOSP styling!! KitKat has arrived!!!
Recovery: [RECOVERY LOCKED] Safestrap Recovery v3.71/v3.72 [2014-04-02 KK Beta]
Bootloader: MJ7