I think you missed out one important part about gunbuster buster beam. that its freezing beam of minus hundred million degrees. why such extreme minus temperature? because as you already know space monster has entropy reversal, extreme minus temperature might be neeeded to bypass such cheat ability.
Using either spherical cap calculator or circular segment calculator, we get sphere/circle radius of 329 px. Assuming planet radius the same as Earth (6371 km) since canonical figure is not given.
Explosion = 134 x 126 px. I just went with the average of 130 px.
Explosion radius = 65 px = 1258.71 km
Using the Star Destroyer net nuke calculator and playing around with the values till we get 1258.7 km for air-blast radius (near total fatalities), we get 117.22 Teratons (this is lower end High 6-B or Large Country level). But since you have yet to prove that this was a nuclear explosion, I must divide that by two. We get 58.61 Teratons (this is higher end 6-B or Country level+).
If you can provide evidence that this explosion was nuclear in nature (such as from a nuclear reactor going off), then we can go with Fireball radius (ground contact airburst). That would give High 6-B results (around 139 Teratons).
I don't know how to begin to calc that one. I can only do the most basic of calcs. You'll notice that pretty much all of the calcs I've done involve explosions and shit being vaporized (plus a couple of cloud calcs).
I noticed that you are also working on the Project Ai-ko profiles. If you are wondering why the original profiles were deleted its because they had no reasoning for they stats, i'm also studying the verse [i'm aware that there are other versions of the characters]. There are respect threads for them for example, so you can use them to justify ratings. The Unrestrained punch from Ai-ko is Subsonic Large Building-City Block level (5.83 - 52.86 tons), A-Ko rock kick is: Small Town level. (2.6 kilotons) and the Final A-Ko punch is: Large Town level-City level (820.18 kilotons - 8.2 megatons) calced by Narutoforum. The Dragon God is 2-B MFTL+, but could be 2-A if there are infinite universes in the verse.
Thats awesome do you have links to the calcs as they can be used to justify the stats. They didnt have to be deleted if it already exist. And yeah infinite universes have been mentioned so 2-A would be fine.