Bergevin has never said, "PK Subban lacks character"
He also never said it about Lars Eller. But he did talk ad nauseum about character, grit, not wanting to lose, tough to play against, leadership, etc. when talking about the guys he got for Subban and Eller. Bergevin isn't dumb. Closest he got to being dumb is when he hinted to "things you don't know about" when reporters kept asking about Subban on the day of the trade.
What he said about 15-16 and how it relates to the Subban and Eller deals says everything.
Again, Bergevin is a good politician. He isn't going to say, "Eller was soft" or "Subban wasn't a leader" but he will say, "I brought in two guys who have character, grit, and leadership which was missing." Why was it missing? Because he didn't think it came from the other guys. What's funny is after getting those guys, he was confident the team wouldn't fall down. But after the first round loss, he called the club fragile.
(And he's right about Eller. Just trading Eller and then bringing in Shaw... ugh. One step forward, two second round picks back.)