Board Thread:Questions and Answers/@comment-174.0.49.47-20140930025818/@comment-25470191-20141002001138

Well, the only time we saw vivid memory transfer was with people who had Code (I don't think this is the place for another "did Lelouch get Charles' Code). Nunally was presented as having some ability to read people previously (usually only as a lie detector) hence my description. The end was pretty clear that Nunally had absorbed all the details of the plan when Lelouch died, whether through her power or Lelouch's power.

I think that the majority of characters understood Suzaku was probably the most skilled fighter/pilot (with the possible exception of Xingke) and, as nobody witnessed his death directly, could have figured out he escaped the Lancelot's destruction.

As some of the other characters seemed to understand what Lelouch's plan was immediately and how confused they initially were when Lelouch took the throne with Suzaku at his side, I don't doubt this was figured out very quickly. The execution of the plan also explained to everyone who had knowledge of Lelouch as Zero why Suzaku went to his side as he had previously shown himself to be determined, stubborn and inflexible holding on to his own principles.

Just my view though!