Is Cole Caufield really untouchable for the Canadiens?

The second-line center, the right-handed defenseman, the “grinder” type: the Canadiens have plenty of needs.
We know that Kent Hughes and Jeff Gorton, who want to make the Canadiens a contender year after year, are well aware of their team's weaknesses.
They watched the playoff games just like everyone else.
That said, you know very well that to get something, you have to give something. And on that note, the Habs have several young players who could be offered in a major trade.
But