It appears that the match scheduler does not care about multiple opponents/partners in surrogate matches. I checked the Archimedes schedule and the teams that had multiple opponents played each other once in their surrogate match and once in a match that counted.
Here is the scheduler's analysis of the Archimedes schedule, which does not show repeats in matches that count.
Code:
Schedule Statistics
-------------------
#: number of matches played, a '+' after the number
indicates one additional round as a surrogate
d: minimum delta between matches (e.g. '1' means back-to-back)
part: number of distinct partners followed by most frequent repeat count
opp: number of distinct opponents followed by most frequent repeat count
both: number of distinct teams seen as partner or opponent
followed by most frequent combined repeat count
r/b: balance between red and blue alliance appearances
eg, 3b means team appeared as blue 3 times more than as red
4+ repeats: any teams seen four or more times as partners or opponents
team # d part opp both r/b 4+ repeats
---- -- -- ----- ----- ----- --- ------------
11: 8 11 | 16 1 | 24 1 | 40 1 | 0
20: 8 9 | 16 1 | 24 1 | 40 1 | 0
33: 8 9 | 16 1 | 24 1 | 40 1 | 0
51: 8 8 | 16 1 | 24 1 | 40 1 | 0
71: 8 9 | 16 1 | 24 1 | 40 1 | 2r
78: 8 11 | 16 1 | 24 1 | 40 1 | 0
126: 8 9 | 16 1 | 24 1 | 40 1 | 2r
172: 8 11 | 16 1 | 24 1 | 40 1 | 2r
236: 8 14 | 16 1 | 24 1 | 40 1 | 0
254: 8 8 | 16 1 | 24 1 | 40 1 | 2b
291: 8 9 | 16 1 | 24 1 | 40 1 | 2b
314: 8 11 | 16 1 | 24 1 | 40 1 | 0
316: 8 8 | 16 1 | 24 1 | 40 1 | 0
321: 8 9 | 16 1 | 24 1 | 40 1 | 2r
326: 8 9 | 16 1 | 24 1 | 40 1 | 2b
365: 8 8 | 16 1 | 24 1 | 40 1 | 0
379: 8 10 | 16 1 | 24 1 | 40 1 | 2b
433: 8+ 11 | 16 1 | 24 1 | 40 1 | 0
469: 8 8 | 16 1 | 24 1 | 40 1 | 0
525: 8 11 | 16 1 | 24 1 | 40 1 | 2r
639: 8 9 | 16 1 | 24 1 | 40 1 | 2b
694: 8 14 | 16 1 | 24 1 | 40 1 | 0
701: 8 8 | 16 1 | 24 1 | 40 1 | 2b
801: 8 9 | 16 1 | 24 1 | 40 1 | 2r
812: 8 8 | 16 1 | 24 1 | 40 1 | 0
836: 8 9 | 16 1 | 24 1 | 40 1 | 0
840: 8 9 | 16 1 | 24 1 | 40 1 | 0
846: 8 11 | 16 1 | 24 1 | 40 1 | 2r
868: 8 8 | 16 1 | 24 1 | 40 1 | 2b
910: 8 8 | 16 1 | 24 1 | 40 1 | 2r
930: 8+ 9 | 16 1 | 24 1 | 40 1 | 0
948: 8 8 | 16 1 | 24 1 | 40 1 | 0
955: 8 8 | 16 1 | 24 1 | 40 1 | 0
973: 8 10 | 16 1 | 24 1 | 40 1 | 0
987: 8+ 8 | 16 1 | 24 1 | 40 1 | 0
1011: 8 10 | 16 1 | 24 1 | 40 1 | 0
1071: 8 12 | 16 1 | 24 1 | 40 1 | 0
1075: 8 9 | 16 1 | 24 1 | 40 1 | 2b
1100: 8 8 | 16 1 | 24 1 | 40 1 | 2b
1334: 8 13 | 16 1 | 24 1 | 40 1 | 0
1448: 8 10 | 16 1 | 24 1 | 40 1 | 0
1519: 8 10 | 16 1 | 24 1 | 40 1 | 0
1595: 8 8 | 16 1 | 24 1 | 40 1 | 0
1610: 8 9 | 16 1 | 24 1 | 40 1 | 2b
1660: 8 8 | 16 1 | 24 1 | 40 1 | 2r
1714: 8 9 | 16 1 | 24 1 | 40 1 | 2b
1747: 8 11 | 16 1 | 24 1 | 40 1 | 0
1756: 8 8 | 16 1 | 24 1 | 40 1 | 0
1796: 8 11 | 16 1 | 24 1 | 40 1 | 0
1836: 8 8 | 16 1 | 24 1 | 40 1 | 2b
1868: 8 10 | 16 1 | 24 1 | 40 1 | 2b
1902: 8 8 | 16 1 | 24 1 | 40 1 | 0
1967: 8 8 | 16 1 | 24 1 | 40 1 | 2b
2016: 8 10 | 16 1 | 24 1 | 40 1 | 0
2081: 8 11 | 16 1 | 24 1 | 40 1 | 2r
2137: 8 8 | 16 1 | 24 1 | 40 1 | 0
2165: 8 9 | 16 1 | 24 1 | 40 1 | 0
2408: 8 13 | 16 1 | 24 1 | 40 1 | 0
2415: 8 12 | 16 1 | 24 1 | 40 1 | 0
2457: 8 9 | 16 1 | 24 1 | 40 1 | 0
2468: 8 8 | 16 1 | 24 1 | 40 1 | 2r
2486: 8 9 | 16 1 | 24 1 | 40 1 | 2r
2543: 8 8 | 16 1 | 24 1 | 40 1 | 2r
2590: 8 12 | 16 1 | 24 1 | 40 1 | 0
2604: 8 9 | 16 1 | 24 1 | 40 1 | 0
2614: 8 9 | 16 1 | 24 1 | 40 1 | 0
2704: 8 8 | 16 1 | 24 1 | 40 1 | 0
2705: 8 12 | 16 1 | 24 1 | 40 1 | 0
2709: 8 10 | 16 1 | 24 1 | 40 1 | 0
2959: 8 11 | 16 1 | 24 1 | 40 1 | 2b
3003: 8 9 | 16 1 | 24 1 | 40 1 | 2r
3008: 8 9 | 16 1 | 24 1 | 40 1 | 0
3044: 8+ 8 | 16 1 | 24 1 | 40 1 | 0
3145: 8 14 | 16 1 | 24 1 | 40 1 | 2r
3242: 8 10 | 16 1 | 24 1 | 40 1 | 0
3245: 8 12 | 16 1 | 24 1 | 40 1 | 0
3310: 8 10 | 16 1 | 24 1 | 40 1 | 0
3314: 8 8 | 16 1 | 24 1 | 40 1 | 0
3467: 8 9 | 16 1 | 24 1 | 40 1 | 2b
3478: 8 9 | 16 1 | 24 1 | 40 1 | 0
3504: 8 8 | 16 1 | 24 1 | 40 1 | 2r
3612: 8 10 | 16 1 | 24 1 | 40 1 | 2b
3627: 8 8 | 16 1 | 24 1 | 40 1 | 0
4067: 8 8 | 16 1 | 24 1 | 40 1 | 0
4265: 8 8 | 16 1 | 24 1 | 40 1 | 0
4450: 8 8 | 16 1 | 24 1 | 40 1 | 0
4466: 8 9 | 16 1 | 24 1 | 40 1 | 0
4470: 8 9 | 16 1 | 24 1 | 40 1 | 2r
4471: 8 9 | 16 1 | 24 1 | 40 1 | 2r
4499: 8 10 | 16 1 | 24 1 | 40 1 | 0
4501: 8 9 | 16 1 | 24 1 | 40 1 | 0
4537: 8 10 | 16 1 | 24 1 | 40 1 | 0
4545: 8 13 | 16 1 | 24 1 | 40 1 | 0
4585: 8 8 | 16 1 | 24 1 | 40 1 | 0
4589: 8 11 | 16 1 | 24 1 | 40 1 | 0
4637: 8 8 | 16 1 | 24 1 | 40 1 | 0
4673: 8 9 | 16 1 | 24 1 | 40 1 | 2b
4731: 8 9 | 16 1 | 24 1 | 40 1 | 0
4753: 8 12 | 16 1 | 24 1 | 40 1 | 2b
4810: 8 8 | 16 1 | 24 1 | 40 1 | 2r
-------------------------------------
best: 8 14 | 16 1 | 24 1 | 40 1 | 0
worst: 9 8 | 16 1 | 24 1 | 40 1 | 2 (38)