No, not that Napoleon. Napoleon II of France.
Granted, I'm not 100% on Austrian succession laws but it looks like at one point the Eaglet's mother was third in line for the throne. Should some misfortune take out his mother and 2 uncles, rather than him, what happens when Francis I dies?
Had Napoleon been pulled from the succession at this point? Could he inherit through his late mother? And would the Austrian court have the audacity to put a former Emperor of the French on their own Imperial throne? And the all important question I always ask, what happens next?