all you got to do is watch toney vs couture
toney was a very skilled boxer,
ive been watching mma since the 80's no way a boxer can beat a mma fighter, without a few years of mma training.
that being said i do think boxers can take better shots than mma fighters and have better defence against strikes.
holly holm has been training mma for around 4 years i think she also did kickboxing, so saying she went straight from boxing to becoming a mma
champion is not accurate