Defoe by a distance - I would imagine he is feeling a bit betrayed. And I wonder if Harry would have gone for the traitor Keane if Defoe hadn't been injured.
In the event I don't think Harry had much option, he needed someone.....and quick!!!
Whether it was a good move long term we will have to wait and see.
Yes, Bent is fast once he gets going, but often it's the first yard or two that matters, Defoe, Keane and possibly even Pav are quicker in that respect. Well maybe Pav isn't quicker but he is much better at wrong footing the defender to gain a bit of space.