I mean, the in-game stats are primarily a gameplay mechanic, not true to life. We have dino hybrids, mutants like the Apex dinos, and inaccurate representations in stuff like Velociraptor. So if you want true realism, this isn’t the place. The stats were defintely inspired by real life, but ultimately determined by balancing reasons.
I do agree that T Rex has somewhat been outshined by Allo G2 and now Acro, but I’m not sure what to do about that. I don’t think it should do more damage: it’s still tied for the highest damage besides Mortem, and T Rex should not be outdamaging Mortem. Even from the perspective of realism, it still does the most damage out of all the real-life creatures in the game - it makes sense that a monstrous T Rex mutant like Mortem would outdamage a real T Rex. Though I maintain that the stats do not and should not perfectly reflect real life. Plus, if you look at the information we have about Acro so far, while I couldn’t see the level, it’s attack seems significantly lower than T Rex, so it wouldn’t need a damage buff to outshine these two in terms of raw damage output (though Allo G2 does get fairly close, especially considering Rending Takedown). If anything, they could nerf Tenontorex’s attack slightly so T Rex is more clearly the “number 2”. Giving T Rex a bit more HP or maybe some speed might work though? If you think about the class triangle they’re going for, cunnings are faster than fierce, and resilients can become faster than cunning through deceleration, so fierce should be faster than resilient but slower than cunning. I do worry about that though, because speed tends to be a chomper’s only low stat, so you can make some really fast boosted monsters quite easily.
I want them to experiment with what fierce can do besides simple shield break (not saying that cleansing is the way to go though), but unfortunately that means that some of the more straightforward fierce dinos like T Rex seem plain by comparison.