Let me see what I can glean from some older fancystats data. I'll use evolving-hockey's 3yr weighted average percentile ranks, which uses data back to 2007-08.
Here's how the leafs' D has looked heading into each season by this number:
asterisk = 1yr of data only
'21: 1.Muzzin 92, 2.Rielly 88, 3.Brodie 82, 4.Dermott 78, 5.Holl 34, 6.Bogosian 21, 7.Lehtonen/Sandin/Liljegren
'20: 1.Rielly 97, 2.Muzzin 89, 3.Barrie 69, 4.Dermott 65, 5.Ceci 14, 6.Marincin/Holl/Gravel/Sandin/Liljegren
'19: 1.Gardiner 89, 2.Rielly 68, 3.Hainsey 48, 4.Zaitsev 31, 5.Marincin 29, 6.Dermott/Ozhiganov/Rosen/Holl
'18: 1.Gardiner 86, 2.Hainsey 58, 3.Rielly 47, 4.Carrick 45, 5.Polak 21, 6.Zaitsev 11*, 7.Borgman/Dermott
'17: 1.Gardiner 75, 2.Rielly 54, 3.Polak 41, 4.Marincin 18, 5.Hunwick 8, 7.Carrick/Marchenko/Corrado
'16: 1.Gardiner 69, 2.Rielly 57, 3.Hunwick 37, 4.Polak 27, 5.Phaneuf 23, 6.Marincin 17, 7.Carrick/Corrado
'15: 1.Franson 84, 2.Gardiner 69, 3.Robidas 64, 4.Phaneuf 58, 5.Rielly 57*, 6.Polak 45, 7.Holzer/Percy
'14: 1.Franson 91, 2.Phaneuf 82, 3.Liles 76, 4.Gunnarsson 71, 5.Gardiner 62, 6.Fraser 61, 7.Rielly/Ranger
'13: 1.Liles 89, 2.Gardiner 87*, 3.Phaneuf 71, 4.Gunnarsson 67, 5.Franson 66, 6.Komisarek 12, 7.Fraser/Kostka
'12: 1.Liles 96, 2.Phaneuf 65, 3.Franson 65, 4.Gunnarsson 64, 5.Schenn 57, 6.Aulie 12, 7.Komisarek 5
'11: 1.Phaneuf 83, 2.Kaberle 82, 3.Lebda 46, 4.Gunnarsson 45*, 5.Schenn 34, 6.Beauchemin 24, 7.Komsiarek 8
'10: 1.White 83, 2.Kaberle 72, 3.Finger 65, 4.Komisarek 18, 5.Beauchemin 14, 6.Exelby 10, 7.Schenn 2*
'09*: 1.White 81, 2.Finger 75, 3.Kaberle 72, 4.Stralman 40, 5.Kubina 38, 6.Schenn/Frogren/VanRyn/Cola
So this year the data likes the leafs' D better than it ever has. So that's nice. The data doesn't think the leafs have ever had a top-3 really even close to this one. Also the depth looks as good as it's ever been.
Looking back, we had good reason to be excited going into that 13-14 season. Phaneuf had yet to fall off a cliff, even if he wasn't elite, Gunnarsson was solid, we had a couple analytics darlings in Liles and Franson, and a couple of exciting young talents in Rielly and Gardiner coming in. Of course, that fell apart almost instantly - over the next 2yrs Phaneuf fell off a cliff, Liles and Gunnar were traded for plugs, Gardiner was sent to the minors, Franson left as UFA.
Looking back, I'm most surprised to see the analytics having such a crush on Liles, and hating Beauchemin so much. I wouldn't have guessed.
Also, it turns out Jeff Finger was actually pretty good, and better than a bunch of the more expensive guys we signed. Hilarious.
Meanwhile, the Komisarek saga was just sad from start to finish. He was awful evenbefore we signed him to that idiotic contract.