I don't remember who the original artist was called but the original was concept art for Prior Extinction.
All shall tremble before the guandog.
As we all know rex and eo get bodied by literally anything more agile than them (i.e most 1 slots and 2 slots). Solution? They just need to pivot faster, that is literally all.
Both rex and eo are mostly meant to use brute force to fight enemies head on, so being able to turn faster with precise movement would make it much more difficult to get around them while still reducing their agility if they decide to give chase.
This is also logical from a scientific accuracy point of view, since pivoting is something ceratopsids were likely very good at due to their compact bodies. I don't know much about that for Tyrannosaurus, though I assume an animal that hunts ceratopsids regularly would probably also be good at getting behind them.
Every playable should have weaknesses to balance out its strengths, but it seems silly for an apex predator's (or adjacent herbivore) weakness to be animals 1/50th its size, instead of being countered by something in its own weight class.
For the record this is not regarding eo's recent fiasco with piercing damage, that is a different ball park.
You will instantly die and lose all your items and any tame you were riding.