I still find it odd that they named Watanabe's character after Daisuke Serizawa from the original 1954 film (and made him Daisuke's son in the tie-in comic) when his role in the story is more like that of Kyohei Yamane, the elderly scientist from the same film (who had an expository cameo in the second).
Maybe he'll still create the Oxygen Destroyer here as a last ditch weapon?