I think Tubridy was more scared of asking a difficult question that Ahern was of answering one. The problem is that RTE is scared sh1tless of FF. A few weeks ago Lenihan got a real probing interview on Prime Time. Obviously Prime Time got told off afterwards because the the followiing week Mirian O' Callaghan gave Cowen the easiest time possible and gushed at the end: "We don't see you often enough, Taoiseach. Please come in again soon!"
At least the Tubridy show is supposed to be light entertainment(I think) Prime Time is supposed to be a serious current affairs programme.