Aren't our little "helpers" wonderful! My DGS does the same thing if we go into a fabric shop.
Last time he was pulling bolts off the shelf and putting them in the basket and then telling me to go back down a different aisle and get a certain one too.
I made him choose which one he wanted most and put the rest back as I was on a budget and could only get what was really needed on that trip.
He ended up getting the Monsters U fleece blanket kit. But he only wanted the panel not the solid so I ended up with the pretty aqua piece for me.
And your DGS will think his super heroes are the best ever!