Pantagotitan was Vegetarian

This is to dispute that the biggest animals that roamed this earth were carnivorous.

Weighing 70 tons and stretching 120 feet was the Gigantotitan.

Giganto = Gondwala

Titan = Large

The First hypothesis is that animal eat what is available in plenty.

Second hypothesis is that competition for food resources and scarcity of food leads to species extinction. That goes parallel with emergence of carnivorous species.

The Third hypothesis is that the tectonic plate displacement and isolation of large land masses lead to different ecological niches.

In other words evolution cannot be linear or consequential. Darwin had limited time and resources and he was instrumental in  bringing out the survival of the fittest concept but I dispute that claim, at least in the beginning when dinosaurus were roaming this planet and the living beings were harmonious except pests like giant fleas. These species were thick skinned and unless the parasites had syringe like proboscis sucking blood would have being difficult.
I am open to the concept that giant cockroaches were feasting on dead carcases but I am at variance with mosquitoes having a good time. Their eggs were very resistant whereas mosquitoes eggs need precise environmental conditions for success.

The frogs also had a difficult time in evolution but not amoeba.

In the beginning there was plenty.

That plenty came from plants.

These plants did not have 50 cell cycle limitation.

Their growth were determined by the principle of accretion. What it means is the accretion of cell layers on the growing surface leads to gigantic (proportions) creatures evolving.

The width or circumference of a plant grow by nature  of adding a layer on top of another layer.

The length of the tree (roots, too) depends on how fast the growing tip proliferates.

Sunshine and water were limiting factors.

Appling these simple principles to gigantotitan, I deduce the following.

The growth of the neck paralleled the height of the plants.

The size and strength of the trunk paralleled the length of the neck.

By the way, grasse were late in evolution around 100 million years ago.

Talking about grasses bamboo would have evolved first and grains (period of evolution of birds) would have been nonexistent.

The elephants and giraffe have long trunks and necks and are herbivorous.

I have no clue as to why there was a long tail except it followed the simple accretion protocol but with diminishing returns.
I cannot support balancing the weight strategy since the tail was placed at a higher elevation. May have had some help in turning and running.

The legs were more important in balancing.

By the way, the scale of the dinosaur was determined by computer simulation.

AI technology solely depends on the data one feeds.

The teeth were definitely herbivorous.

I have no idea about soft tissues, namely heart, liver, kidney and reproductive organs.

The possibility of asexual reproduction is probable, at least in early stages but sex orientation lead to diversity.

Paleontology is a fascinating subject.