No, there is no reason other creatures would be removed from combat, they're just untapped.
506.4b. Tapping or untapping a creature that's already been declared as an attacker or blocker doesn't remove it from combat and doesn't prevent its combat damage.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
When you exert him does it remove other attacking creatures from combat?
They hate us cause they ain't us.
They hate us cause they ain't us.