There is little chance that Julius is gray. It is improbable that Bernhard is a swan. It is almost certain that Brian is green.
Chances are slight that either Bernhard is a swan, or Brian is green.
It is highly likely that either Bernhard is a swan, or Brian is green.
Chances are slight that either Bernhard is a swan, or Brian is green.
Either Bernhard is a swan, or Brian is green.