I doubt about how fast The Rock will be. He gained success much due to fast attacks against some stronger players. Now, without being in practice, I'm not sure if his fitness would be at his peak.
I think original Sincara is the one that came later in the match because, the other Sincara was doing whatever possible to damage Sincara's face reputation.
Also, that Sincara looked a big fat than the original one to me which the one that came later was more looking like reflexive and fit Sincara as he always has been.