The important consideration are the alternatives. He may easily create that much value but are there other people (substitutes) that could create as much or nearly as much for far less than 100M?
Being that there aren't many people with this ability, and that there are absolutely no indicators as to their performance apart from letting them do the job over a prolonged period (as many companies hiring hotshots discovered), and that the position is directly responsible for billions in revenue - I'd say that it's not realistic to expect a drop in replacement.
