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Turns out the cause of most of my issues was in the coordinates I was feeding to grabCut. After I fixed them most of my issues went away.

Other lessons learned:

• No need to reset the models from my experience
• The comment the initial values of the mask are indeed a typo
• The 255 value on the mask was due to the way the python example works, to make the mask visible for for display.
• And of course, I need to check my inputs properly

Thanks for the help @LBerger, it helped me a lot.

Here is my updated block from above: https://gist.github.com/pcardoso/5ecc901062b3ac7e5160bfb308f3fd5f