4) No because Payment of the minor = Block value x minor hashrate / total hashrate, if you increase displayed hashrate more than real hasrate of pool, you stole your minor... They loose = Real hashpower of pool PH / ( declared hashpower of pool)
This is where that argument falls to pieces. Why would slush want to do such a thing? He could have used the hash from the pool to mine NMC for himself without giving miners the option to earn the mined NMC and he would make more from that. This is the very same guy who lost
BTC 2000 (was it more?) only a few years ago and nothing of the sort of accusation was thrown at him in the following period, until now.
At the end of the day, everyone SHOULD know what their hash rate is supposed to earn them over a reasonable period, say a week. If your rewards are less than that and feel you can get better somewhere else, move it. I personally, since the demise of ghash as we knew it, have not mined at a better place than slush (and yes, been to the slow cooking heist pool too!).
You haven't explain how "my argument falls in pieces". I have not write that he have redirected hashpower to do something else.
The best way for a pool manager to rip of his users is to do a false increase of hashpower of the pool.
That appears like bad luck (or block withhold...) and if he not overdo, it's difficult to see that because of the variance.