Rich, I don't know why you're always so cynical... however, here's the explanation once again...
Call my cynical if you like.

But..... I still find it curious that 6 Months ago 50 miners representing around half the network appeared out of nowhere and have now moved on from ninja to an anonymous pool.
As they are so dominant it would be nice for their background and objectives to be made clear as opposed to your rather thin "explanation" of them being "a large group of miners"
BTW I actually quite liked the option of Mining with them as it made for a very steady and predictable income, as opposed to the variance that one faces on a Pool winning very few blocks.
Rich
Well, as far as I know from my communications with them, and their decision to help development with 2% of their mining income, and also still support the assets based on the other pools, they have no mal intent whatsoever.
I think that potentially we can consolidate on a few of the pools, and make a few larger ones, and/or just wait for more miners to join. I'll also ask them if they're willing to move a few back to ninja. I do know that they didn't like the higher deadline limits on the smaller pools, so they prefer ninja's limit or lower.