No the T as planned is not a G train. The G train goes between 2 boroughs(Brooklyn,Queens). The T only goes to one Manhattan. The G train does not replicate any other line. The T runs parallel to the 4,5,6 lines. The G trains serve areas with no subway alternative, the T does not. Why would a rider wait 5-6 minutes rush hour or 10-12 minutes off peak when they can just wait for the 4,5,6 trains which either one will make it up to 125th St. The Second Ave Subway llne will fail unless it is extended itself to the Bx. However I do not support a link up with the Grand Concourse Line. That would just be redundant. It should just jo up 3rd ave or swing towards Throggs Neck or Classon's point. Or better yet rebuild a connection to the Dyre Ave Line