I'd like to ask again, if there is clear cut evidence that this is a legit mining operation. Such as showing an address that receives newly generated coins.
Nope. No evidence that they have the hashrate (over 500 TH/s now). The payment is sent through mixer rather than from new coins.
You can find lots of discussion here.
https://bitcointalk.org/index.php?topic=484355.0;all