Udyr is too short range to be effective against the ad carry unless you get close through the bushes or they don't move.
Although some people, ok I mean a lot of people or the whole board will disagree with me. Amumu support is quite a good idea. He at least has a gap closer stun which can help. Can consistantly damage the support and ad if close and ult to help win bot.
Taking the Dustiflier easily for KH 358/2 Days :http://youtu.be/XH6LFvUVrjM