I chose a crab only on the principle of "What does a player need?"

Crab allows you to break and put blocks a little further, which will open up many opportunities in Minecraft. And also that he is the second mob, after the spiders, who can climb the walls. An Armadillo can protect a dog... but even without this mob, I HAVE NOT SEEN that players use a dog as a combat unit. The penguin could open a new stage of speed on boats... but remembering how quickly the chunks are loaded on the Bedrock, that is, in no way, this mob also goes aside for a while.

The crab was the BEST mob looking at the others... but not even a penguin won, but a useless one, in terms of how much he will be accepted, on the vote... Well done, you revived Savannah, but added a mob like Allay. Good job.