It's good to see the lads rip and tear, and I get that this manga is all about the fanservice, but I prefer it when there's a real threat to overcome instead of instant gratification. Elite beastmen aren't weak, and Delga himself is strong enough to capture the throne without issue under normal circumstances. People wouldn't suffer for centuries if that wasn't the case. Sometimes the assholes are capable and competent. It's that much more satisfying when you take 'em down.