Alternative interpretations in the Mishna

I have a question about the alternative explanations in Mishna.

For instance: In Mishna Sanhedrin 4:5, two explanations are given for the reason behind the plural use of blood(demei) in Genesis. One results with a much more serious message(being held responsible for killing his offspring), and the other is only concerning Cain(his brothers blood was spilled over many places).

My question is: Do you take both interpretations equally(Like, taken from the example above, G-d wanted to give us two different messages by using plural “demei”, or do you think that these are two distinct and ‘possible’ explanations for the plural use of that word, and though both are important and meaningful, one of them is more likely to be the true reason on why G-d used that word.