The reality blitzing feat I assumed everyone knew was stupid and wonky and so ignored
The Captain Marvel feat comes from Shazam!: The Monster Society of Evil Vol 1 #4 (September 2007) and Death Battle did do a calc that was like 90 foe IIRC, but the pixel scaling was using different perspectives and thus wonky and overrated. I did
a better calc which was High 4-C, about 10 foe. However, I think this story is noncanon because it's a weird retelling of Billy's backstory never referenced and overall ignored in favor of the original origin story. So IDK, I think the feat isn't even canon
Also I personally don't like the black hole feat. I think it meant quickly over time, and tbh I think it's just a lifting feat for Supes, but
shrugs
I am also frankly against using inverse square law to lowball supernova feats for Superman/others. It is overly picky and just makes the feats less believable if they are struggling with tier 7/6 amounts of volumetric energy when the intent and progression is clearly portraying it as tier 4. So I think the Brainiac destroying the star feat is 4-C, the GL supernova tanking is high 4-C, etc.
Also, I was talking with Firestorm and the Alan Scott feat might be an outlier in that the feat is
too low for him. He might have gotten weaker at the time, very likely as Firestorm told me he lost a lot of power after Zero Hour (I think?), but a lot of his showings were guardian level+ and was portrayed as wayyyy out of the GL corp's and JLA's league.