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From someone who runs a pool its pretty concerning that you dont know how blocks are found. If our software can submit a valid share to a pool, it can also find a valid block and thats all the proof you need. But you already know that or should know that...so once again whats your agenda?
Alas this statement is completely false and thus shows that indeed these miners have not been tested to be able to find blocks.
The usual worry about people who don't understand what they are doing and are only looking for profit.
Even phil has made an attempt at understanding the issue in his post above, but alas not quite got it right.