I am not sure the question is not answered by one, but I'll elaborate just so we are clear. If you can find a block with an rPi ZERO then you'll agree the mBTC is covered by that block, or am I missing something here? Then again, I am not sure one rPi ZERO can not mine an mBTC and still be re-useable, be it for tinkering or as an expensive controller, and that in effect being the proof that cpu mining is not dead.
But you are right, you started this thread and you must be correct.
Me starting the thread does not make me god.
But it doesn't really matter here, i'm just pointing out;
You can't say "To get millions of USD, just go buy a lottery ticket." and its what you're saying here. Every time this would be applied, for nearly everyone, this would be false.
Therefore saying a RasPI0 can be used to mine BTC blocks is wrong as well.
I think the you are correct the RPI will not be used to mine even as lotto. It needs a secondary miner hooked up to it, you can use U3's, Compac's, etc. But a RPI alone is not enough CPU/GPU combo to really mine alone.
Although I would love for someone to prove me wrong and do a mining unit with 4 in a stack:
. I love that case just never have had a use to get a case for multiple working together.