Yeah, that is my point though... change for changes sake is pointless. Little things like running in straighter, or getting your front arm higher will help! As long as its safe, and effective, leave it be. However, when things start falling apart, that is when little changes should be made. In those pictures, there should be a lot of things that should be worked on because a) they're not a complete overhaul, and b) they're bowling very poorly currently.
Buzz, if Malinga had come through this countries system, there would be no way he would have got to 15 with that action, let alone test match level!