After "Irradiator", we have enough information to start eliminating potential Jekylls. He is: a white man, with black or dark-colored hair; of slight build but strong enough to overcome a big man like Langston in a fight; a surgeon well able to perform delicate surgery; and has access to enough cash to be able to pay a man $5,000 to build precision surgical equipment.
That last, in my opinion, is enough to eliminate young Milander, who I never found a plausible suspect anyway. The events of and/or physical description of Jekyll that "Irradiator" provides us with eliminates: Nick, Ray, Archie, Doc Robbins and SuperDave. And, though I hate to say it, I think the jerk surgeon that provoked Ray is probably eliminated. He seemed to be a bit heavier in build than Jekyll.
That last, in my opinion, is enough to eliminate young Milander, who I never found a plausible suspect anyway. The events of and/or physical description of Jekyll that "Irradiator" provides us with eliminates: Nick, Ray, Archie, Doc Robbins and SuperDave. And, though I hate to say it, I think the jerk surgeon that provoked Ray is probably eliminated. He seemed to be a bit heavier in build than Jekyll.