I did a quick search on his name and came up with a biography on him. Here is a small excerpt from the following link. After being fired, Grant then moved down the dial to WOR where he continued to host the same type of show in the same time slot; he would occasionally criticize his WABC replacement Sean Hannity. In the late 1990s his show went into national syndication, trying to follow the lead of Rush Limbaugh and other successful conversative talkers, but few stations picked it up and it reverted to a local show.
It would seem your accusation that Rush stole his act from Grant is also wrong. Seems to me that he was trying to follow Rush's lead. Also from what I have read about Grant (I have never listened to him). He is loudmouthed and hangs up on people. Rush never does this so I don't see how you could say Rush stole his "act" from Grant.
In what way did Rush steal his act from Grant? **Note - this is your chance to give some facts and not just make wild accusations**