I think that both players, particularly Anthony, would limit how much the Cavs are blown out by when LeBron is off the court. Is that enough to pass the Warriors? Who knows, but it certainly would be impactful.
But the LeBron Superfriends team is one reason I'm okay with the Celtics not making a splash this summer. If the Cavs are able to add above-average starter quality players for the minimum, there really is no point. Preserve the current roster, keep folding in all the young players, and be ready for a run of dominance starting in a couple of years.