This is an incredibly weak argument. "I'm not saying it, this is what I hear from my pro contacts." Really? You want to invalidate the counterpoint to your take and that's how you do it?
Chara is a shell of the player he once was. Chara is a marginal dman. If a cup contender traded for him at the deadline, it would not be for him to anchor their top pairing. So you can save that nonsense. He's turning the puck over too frequently, his spacing on the ice has been suspect, his clearing attempts have been poor (this is a huge issue with literally everyone on the team right now) and he's getting knocked off the puck and his feet way too often, by far smaller players these days, decent plus minus aside.
I said it before, but I'll repeat it now for you: While his gaffes with the puck haven't cost the team yet, it's a matter of time before they do. It's simply the law of averages. At some point, he's going to trip over his own feet when skating out of the zone with the puck, cough the puck up, and it will end up in the back of their net.