Spec,
In your analysis how EB3 retrogressed countries limit visas to EB3-ROW, you should consider one more ( the most important) factor, the PD. If PD of ROW is older than EB3-I, ROW would get the visa first. The fact is EB3-I is at 2003 and EB3-ROW is at 2010. You are not considering that disparity in PD in your analysis.