The problem is that a little bit in an Am. Light Lager stands out like a lit match (ha!) at night.
I wouldn't deep-six a Light Lager for having a bit of sulphur, provided it was light within the context of Am. Light Lager, and especially if it dissipated. It might cost it a point or two in the aroma section, and maybe one or two in flavor if it came through there too, but that's about it. We might be looking at a 37 instead of say a 40 hypothetically.
It becomes problematic when it pushes up to and gets beyond that threshold of 'light'. The notion "Light" must be qualified to mean "light within the context of the style". For example, light esters in an English Pale Ale would be obnoxiously fruity in a Light Lager. Light in 1A is REALLY light.
Now, in a BOS round, even subtle sulphur could well likely end up being enough of a subtle factor that knocks it from the table, while an appropriately light sulphur in 2A would not be challenged. It depends on what the other subtle factors are in all the other beers that may knock THEM from the table.
Hope this made some sense.
Steve