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My opinion:
1) If the tracking is good, it's good, although the tube may be on the weak side
2) If the tube tests good, it's good, although the tracking (cutoff or G2's) in your set may be misadjusted (causing blue shadows)
Now, if you got a set where one gun could not be adjusted and it tested different from the others, your tester would be telling you that the problem was the tube and not the adjustment. You don't have that in either case you mentioned.
For case (1) you just have a warning that the tube that is giving acceptable tracking now may be on the way out, but there is no need to panic until you see some degradation in the picture.
For case (2) you are seeing that the tube is probably just fine and therefore you should look for your problem in the circuitry.
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