Glad it's all working for you. I know nothing about Odin, I don't have a computer. I have had zero issues with 12.1. Only had trouble with battery drain keep awake problems due to Google Now/Google Play services which I have tamed through the privacy guard in CM.
Update ended up going for it. Odin did not show a yellow or blue square for me.
So just trust the com port and message window saying 'added'.
All good.
a useful link for flashing with stock http://forums.androidcentral.com/verizon-galaxy-s-iii-rooting-rom-s-hack-s/191375-guide-restore-back-clean-factory-stock-update-10-23-a.html
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