Have that list handy or is it simply doing the math for +/- combined? And yes that is a massive asterisk. We all know I could sit behind the net and give the puck to McDavid curling and I could get a point for it, let alone +/- differential. But same can be said about MacKinnon and any other superstar, albeit McDavid is the best there.
I mainly put Heiskanen and anyone because he split time with Hurley and Suter, but heiskanen is sooooo good defensively, he can carry anyone. Many of those pairings one dman is dramatically better than his pairing, but as far as playing actual defense I'd take all of those over Bouchard-Ekholm.
Makar/Toews is IMO the best pairing in the league and the gap isnt really close to any other because Toews is much closer to Makar (top 15 IMO overall) than any other 1-2 duo.
If were purely looking at offense, then it gets skewed real quick.