I have a 50-70 ft. oak tree in my front yard that needs pruning. I've gotten several estimates, and two of the guys seem to really know what they are talking about. They have given me two different opinions about one specific thing. My tree has an indention where the trunk splits into the main branches. Both guys agree that it's holding water. One guy says there's nothing you can really do, and one guy says he can cut a notch in it to allow the water to flow out. Which guy is right?