Also, this analysis is fundamentally flawed because mining is time-dependent. Run the miners on 6 new addresses for several days (STARTING AT THE SAME TIME) and compare those graphs. That would tell you a lot more.
The graphs are from six different miners taken at the same time. I can understand that not knowing who was mining where is a flaw in the analysis (although, why should WE be choosing where to mine @ middlecoin in the first place).
But I don't understand your reference to their timing? If the graphs are showing the same time period and you can see the begin & end situation of each miner..