I appreciate your concern.
Willow is fine. Since heart murmurs are graded 1 to 6 then I'd say 3 is just below "middle of the road". They will not actually DO anything for him right now. I am just suppose to be aware of any possible symptoms that suggest cardiomyopathy. What they will do, is year to year they will COMPARE what they hear.
I realize the vets may or may not have heard it last year, but my concern is "what if it were something more serious" Something where a year could have made the differnce between life and death. THAT was my point. After all, last year was the first year I ever skipped my cats yearly physical, and I did it with 4 of the others, too. :( I said to my self "They are young and healthy, they can get away with every other year" I never even considered skipping with my older cats, the ones much more likely to actually NEED to be checked.
So I just wanted to spare anyone else from wishing they had not cut corners.