For me it is more important of number of contracts than number of traders, if I went long 100 ES and buddy went short 100, that is one trade. But if I go long 100 and the que in Globex has 100 traders doing a one lot each then considered 100 trades, and if I was exiting, still be 100 trades. I don't see how any of them would help or make a difference? I certainly use volume for some signals, but number of traders never cross my mind, I wouldn't even know how the information would help.