Avengers Unlimited didn't even have a regular cast. One arc might be Iron Man and Captain Marvel, another might be Captain America and Black Widow. At one point an arc was about Ant-Man, Rocket Raccoon and Groot (there's no GOTG Unlimited comic and Ant-Man was on the team a few years ago)! They're mostly just fun side stories and have no impact on continuity (though they do reference the print books sometimes).
It's now been replaced by Avengers United, which uses McKay's roster.