Apollo Creed has more integrity than Daniel
Apollo Creed could have left Rocky alone and moved on in his career. However, he felt that his victory was illegitimate. His quote was, "man, I won but I didn't beat him!" Apollo knew that according to the Queensberry rules he was the winner. However, Apollo knew, as well as the public, that he was not a clear winner.
Daniel on the other hand, celebrated by hooping, hollering, and jumping up and down, like he just wiped the mat with Barnes.
On a side note, Daniel did that very same flip on Barnes earlier in the movie in a non-tournament setting. What happened? Barnes immediately got up unfazed and within seconds had his foot on Daniel's throat.
Daniel "won", but he didn't beat Barnes. He never acknowledged that. Do you think he gave an inspirational Rocky speech post fight? No.