As for what happened to Gentry, the explination is quite simply politics. If you recall the Brass Bishop storyline in Vol. 2 Gentry revealed that the wife of the Prime Minister was his sister. So obviously Gentry got int o the position largely on his family connections. Naturally, in the rather jerky flow of time through the Marvel universe, some years have passed in Canada and most likely a new PM has come in with a different agneda for Dept H. So the ex-PM's brother-in-law was probably not part of that.