The pod still had the energy and Monkeyboy still has a face that looks like Hater with skin. The nickname "monkeyboy" does not disqualify it either, since it's common in plenty of media to not care and call apes and monkeys whatever because most people don't actually care about the difference. Some even go as far as to use monkey as an insult toward anything that could be considered a great ape. In addition, Hater uses magic and is a living skeleton. For all we know, he got bigger, or maybe he was just a big chimp.
Also, ape skulls are horrifying, especially if they have eyeballs floating in the darkness of their eye sockets and seem to be alive without skin.