Come now, he's like the third strongest human, and the strongest (Krillin) said at the time that he would have been killed by the saibaman kamikaze too if he wasn't alerted to it by Yamcha's death. Also, it's not like that is in the same dimension as where he is by the end of Z, let alone where he gets in Super, since Dragon Ball is the worst media in the world when it comes to "number go up" power creep.