I think cypher is counting all nodes not just the top 5. the metric to watch is, 1 and 2 are they dropping? 1 /Satoshi:0.11.0/ 2229 (36.30%) 2 /Satoshi:0.10.2/ 1158 (18.86%)
Something you might want to consider; is of the massive mining power in china only one node (from the 105) is actually running XT