In the interests of continued contribution, despite my hypothesis pertaining more about forwards than defense, I went through both Earl Seibert and Tim Horton's team splits. Tim Horton's will be in this post, and Seibert's in a separate one. I was going to withhold Horton's post-expansion splits initially, given his 1000 game sample size prior to expansion, but since he did have the 2 AS-1 seasons post-expansion, I'll include them as well. Horton's pre-expansion splits are remarkably consistent, as he averaged about the same versus every team except the Rangers, where he had nearly 20 additional assists over his 15 full seasons - basically an extra assist against them a year.
Tim Horton O6 Era
| 52-53 | 66-67 | | Total | | |
| Games | Goals | Assists | Points | +/- | Shots |
BOS | 191 | 20 | 53 | 73 | 57 | 233 |
CHI | 197 | 19 | 53 | 72 | 16 | 200 |
DET | 197 | 20 | 49 | 69 | 33 | 237 |
MTL | 198 | 15 | 53 | 68 | -22 | 226 |
NYR | 199 | 17 | 70 | 87 | 28 | 238 |
TOR | 0 | 0 | 0 | 0 | 0 | 0 |
| 982 | 91 | 278 | 369 | 112 | 1134 |
| | 0.093 | 0.283 | 0.376 | | 1.155 |
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Tim Horton
BOS | | 0.105 | 0.277 | 0.382 |
CHI | | 0.096 | 0.269 | 0.365 |
DET | | 0.102 | 0.249 | 0.350 |
MTL | | 0.076 | 0.268 | 0.343 |
NYR | | 0.085 | 0.352 | 0.437 |
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In terms of Home/Road splits, nothing really stands out, except that Horton was exactly even at Home vs Montreal, while being a big plus against the other 4. He was also a minus against Chicago and New York on the road, while being a plus versus Boston and Detroit.
Here's Horton expansion splits in full - in his 2 AS-1 seasons right after expansion, he basically put up half his points against O6 teams and half against expansion, and in the first year half and half for plus/minus, while in the second year he was -2 vs O6 teams and +16 against expansion teams.
| 67-68 | 73-74 | | Total | | |
| Games | Goals | Assists | Points | +/- | Shots |
ATL | 9 | 0 | 2 | 2 | 9 | 16 |
BOS | 38 | 1 | 8 | 9 | -15 | 61 |
BUF | 10 | 0 | 1 | 1 | 2 | 16 |
CGS | 32 | 1 | 10 | 11 | 18 | 56 |
CHI | 39 | 1 | 9 | 10 | 13 | 77 |
DET | 46 | 2 | 9 | 11 | 13 | 71 |
LAK | 34 | 1 | 7 | 8 | 13 | 54 |
MNS | 29 | 3 | 10 | 13 | 7 | 67 |
MTL | 45 | 3 | 9 | 12 | -8 | 93 |
NYI | 8 | 0 | 2 | 2 | 5 | 10 |
NYR | 33 | 3 | 13 | 16 | -3 | 52 |
PHL | 36 | 1 | 13 | 14 | -8 | 99 |
PIT | 33 | 1 | 13 | 14 | 18 | 56 |
STL | 33 | 3 | 9 | 12 | 9 | 60 |
TOR | 21 | 0 | 2 | 2 | -1 | 23 |
VAN | 17 | 4 | 8 | 12 | 7 | 33 |
| 463 | 24 | 125 | 149 | 79 | 844 |
| | 0.052 | 0.270 | 0.322 | | 1.823 |
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Broken down into the three sections I prefer:
| 463 | 24 | 125 | 149 | 79 | 844 |
O6 | 222 | 10 | 50 | 60 | -1 | 377 |
E1 | 197 | 10 | 62 | 72 | 57 | 392 |
E2 | 44 | 4 | 13 | 17 | 23 | 75 |
O6 | | 0.045 | 0.225 | 0.270 | | 1.698 |
E1 | | 0.051 | 0.315 | 0.365 | | 1.990 |
E2 | | 0.091 | 0.295 | 0.386 | | 1.705 |
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[O6 is BOS/CHI/DET/MTL/NYR/TOR; E1 is LAK/MNS/OAK|CGS/PHL/PIT/STL; E2 is BUF/VAN/ATL/NYI]
Again, you have the higher assist total, but it comes out to like 2 extra assists a year, nothing earth-shattering. More relevant, I think, is the plus/minus split which has held true so far - players are breakeven against the Original 6 teams (minuses against Boston and Montreal, pluses against Detroit usually), and a bunch of pluses against expansion teams. I have a feeling that's going to be broadly true for the entire league, so it doesn't really matter when comparing expansion-era players.