Apertaurus' Affinity isn't beneficial for an evade Apertaurus in any way because you'll be missing out on the +5 evade from your shoe upgrade, so I'd like to propose that it gain +5 evade when not equipped with a shoe slot at the very least.
This passive could do with more of a buff but I think it should gain +5 evade at the very very least, it also pales in comparison to having Miragewalk as well is my reasoning as to why it should receive more buffs than just that.