So the OP's premise was that Terry's play was driving him crazy, ie he wasn't playing well. The rejoinder was that he was "contributing" and people responded to that with "yeah, sort of." And now the goalposts have shifted to "he's not the worst guy on his line," which...fine. Debatable, he's had 3 different centers and looks the same, but fine. He's certainly not the worst point-producer on his line. Point still stands though, he's been bad and he's a zero more often than not.
Zegras IMO has been terrible too, for whatever that's worth. I'm glad his fancystats have picked up so that people who hate fun have a reason to praise him but his actual effectiveness on the ice is close to nil, he doesn't accomplish anything. The line isn't working.