I kinda support From the drawing he implies your pet can attack your opponent that shouldn't happen... The pet should be like an item that is upgrade able like it has a crew like upgrade thingy and the better the pet the higher the price
I guess it would be nice. Having either ordinary pets or mythical animals would be fun, but then if it does happen, they'll only let us chose one. And maybe able to upgrade them using items that drop in parties? I don't know... Just a suggestion, but still i like the idea...