All good points. Particularly about ass-covering, which we know Banks did enough of to end Glass' scientific career.
Of the two, then, I think Ivy King's a better fit; both Cascade's and Dr. Radiation's write-ups say the bomb was dropped, which King was and Mike wasn't. The "previously unencountered" etc. could be a misunderstanding of the Super Oralloy Bomb's mechanics (Mark Johnson, after all, was an aerospace engineering major at the time, not a physics major).
Of the two, then, I think Ivy King's a better fit; both Cascade's and Dr. Radiation's write-ups say the bomb was dropped, which King was and Mike wasn't. The "previously unencountered" etc. could be a misunderstanding of the Super Oralloy Bomb's mechanics (Mark Johnson, after all, was an aerospace engineering major at the time, not a physics major).