One thing to remember is that most (but not all) players are not necessarily thinking in terms of scales. They are simply going where their ears are leading them, and I find this to be a great approach. When trying to break down what scales a certain instrumentalist, focus more on the phrasing and the note choices as opposed to getting to caught up in what scales are going on. Good to know, but make sure you have the physical part down of playing this solo and than try and work some of it into YOUR OWN playing.