Just a couple of things I thought would add a little something to the game.
Passive - All armour piercing abilities against you instead are reduced by armour!
This passive would force the enemy armour piercing ability to instead be lowered by armour. Maybe only have this on dinosaurs with at least 30%+ armour so that other dinosaurs that have a little armour still take armour piercing damage, as there would be no reason for armour piercing if they all had glancing.
Something like Stegodeus and Nodopatotitan would make good candidates!
Or in the case of rat
Passive - You will avoid all swap in attacks
This would stop swap in attacks being abused, but as it would only stop attacks, things like swap in null and swap in distraction would still affect it.