I also don't think he can start over current Inigo, mostly because Inigo is better on the ball, and makes fewer errors, so far at least. While being quite strong himself.
The only thing Araujo brings which can be a big asset, is more physicality and pace. While this is helpful, the main thing required from the CBs in this system is calmness on the ball and very very close attention to the offside line and the movements of his teammates. This means you need to have a pretty high football understanding to synch that well with the rest of the backline. No place for heroics. You don't want to be the dumber that breaks the line thinking he can pick up the runner and dispossess him.
Now, if somehow Araujo gets better on the ball and more disciplined in terms of possession, while also ditching his blunders in terms of bad tackles, he can be a joker card defensively. In the sense that, when the offside trap fails due to simply the opponent timing a perfect run, Araujo is best equipped to put that fire out and save our bacon. If he is careful to not bring the player down and get sent off.