Even with Rodan carrying, Zilla isn't surviving a single gravity beam, and even if he made it, Gigan is cutting through him like a scissors through paper

And he def wouldn't be top 5.

Top 5 would be

5.Hedorah

4.Megalon

3.Mechagodzilla

2.King Ghidorah.

1.Godzilla

Top 10 would likely be

10.Anguirus

9.Gorosaurus

8.Rodan

7.Gigan

6.Titanosaurus

5.Hedorah

4.Megalon

3.Mechagodzilla

2.King Ghidorah.

1.Godzilla

^^Godzilla Junior could definitely take a gravity beam. His durability is very high. Like he survives a volcano eruption while inside the volcano. Completely unphased by conventional weaponry and shit.

He's probably the smartest Godzilla with the most tactical approach to battles. Like I mentioned his AB is pretty impressive, and burrowing puts him at an incredible advantage in most enviroments.

Hedorah is easily stronger than Ghidorah too

Volcanic eruption is nothing to Ghidorah's planet busting beams, and he is not the smartest, Showa def is. Zilla doesn't speak and coordinate. the Showa Kaiju have insane reaction speed, like jet jaguar, who caught Megalon while he was burrowing, and megalon burrows faster, at mach 3. Zilla is just a slower kaiju combat-wise, and his durability and strength is nowhere near enough to survive a gravity beam.

Hedorah isn't stronger than Ghidorah, but her durability is very impressive.

Planet busting? It hurt Godzilla ig, but it never inflicted any real damage. Gigan did more damage to Godzilla with his Hammer Claws alone than Ghidorah's Beam ever did. Like consistently in the Showa era, beams do next to no damage 90% of the time. Like the only real exception to this is Mechagodzilla who can level mountains with his beams.

Don't forget a single blast of Junior's AB would fling most monsters through the air like a ragdoll.

It would fling, but only if it hit them, which most kaiju wouldn't get hit by. and getting sent flying wouldn't do a thing to any kaiju in the Showa era

Regardless, a single strike and Jr's dead

Genuinely the most impressive thing Ghidorah ever did with his Gravity Beam was flinging the Mothra Larva, which weights around 10.000 tonnes. They’re comparable to Showa Goji's AB, which is like, significantly weaker than Juniors.

Godzilla Jr. could take multiple and still be relatively fine.

The bombs from Zone Fighter were able to instantly destroy a planet, but they said Ghidorah was their most powerful weapon. Ghidorah can destroy a planet. Zilla Jr isn't surviving that level, even if held back significantly. Showa Goji's breath being comparable to this means Showa Goji is also at least a planet buster, too. his melee are comparable to his breath like with the kilaak's shield, so any kaiju that fights on decently even ground with him like rodan, gorosaurus, anguirus, jet jaguar, gigan, megalon, hedorah, ghidorah, titanosaurus, king ceasar, mechagodzilla and mothra are all at least planet busters as well.