His merc cruiser outfit has a DT of 3 instead of 1.
Killing the Strange Man and thus failing Birds of a Feather may prompt Caesar to say ""You even disrupted a promising weapons deal with the Van Graffs"" when the Courier meets him at the Fort.
Craig Boone will not automatically engage the Strange Man, though he attacks all other Legion members on sight. This would be in keeping with the Strange Man being incognito.
Although he is a member of the Legion in civilian clothes and claims to have men with him, the Strange Man is cowardly and alone. If attacked, he cries for help and is virtually helpless- out of keeping with the spirit of Frumentarii, who are skilled and dedicated fighters despite often working undercover or out of uniform.