Let's set the record straight. No one has actually identified this as actually being a heart valve but that is the speculation. There are four heart valves and again we do not know which one is affected if any. By far the most significant one is the aortic valve which is between the left (largest) ventricle and the aorta (the large artery that carries oxygenated blood to the test of the body). This valve is the most likely candidate for requiring surgery that would cost Duggan to be out for a period of time or forever.
The reason is that if you must replace it the best type of valve in a young person is an artificial one. It last longer and works better over time. (Anything is of course a crap shoot as all people will be different). The problem with an artificial valve is it absolutely requires that the person be on the blood thinner coumadin. You cannot very well play football taking this.
The other option is a pig valve which does not require blood thinner but it definitely does not last as long as the artificial valve will. Either way a young person person will probably need a redo surgery eventually. Now the good new unlike myself when I had my arortic valve replaced eight years ago, open heart surgery is not absolutely required these days to correct these problems.
Also not only are the techniques getting far less invasive but the redo surgeries are less likely to be as big a deal either. (For other docs pardon me for making this too simple but I have probably lost most everyone already).
So no Wyoming Fog is not absolutely correct in his assumptions.