The understanding of the Jews is not in the least “controversial”, as those who refused to believe left, and those who believed stayed.
You have to invent the controversy to misunderstand this point.
Hmmm. No controversy? Did I write this?
The Jews therefore quarreled among themselves, saying, “How can this Man give us His flesh to eat?”
(John 6:52)
Now you can split hairs and say a quarrel isn’t a controversy. I won’t take that as a serious response. No reasonable person would. So while we were not there and do not know all the details of the controversy, we can be certain there was one, if we trust the words of Scripture.
Peace,
SR