Yea there is solid proof there it's him with the sponge and I have no idea how he got it. I don't know what the punishment is for having that but he should be jailed for a good amount of time because he is breaking rules.
lol imagine this in real life, guy gets caught with sponge and goes to jail. basically what this is but in minecraft xD
You can't have a dragon. It's a dragon egg, it doesn't spawn dragons either. It's just there when you kill the FIRST dragon on the server, in the end.