Parayko's never been the same since the back-injury and loss of J-Bo/Petro. He cannot carry a pairing, like Petro did. Absent a strong partner, he's not the stud he used to be. That's no fault of his own - he's no worse of a player now than he was back then. He's probably smarter and obviously more experienced/savvy by now. He's just thrust into a situation that doesn't suit him. If he had the luxury of being paired with an Olympian in a 2nd pairing shut-down role again, I'm sure he'd go back to being an analytics darling and human eraser.
If all it takes to get Hanifin & a retained Tkachuk is Parayko, Kyrou and a 2nd Doug Armstrong would be a fool not to make it happen. He can pick up a Scott Mayfield, Josh Manson, Damon Severson, Jeff Petry or John Klingberg for RHD depth if needed. RHD aren't the unicorns they once were.