My guild does that. Someone posts "went 3/3 with this" or if they have smurfs, even 9/9. And very rarely that result is replicated by others. I go 0/3 or 1/3 on many "winning" teams.
The notion that SS is deterministic enough so that someone can reliably win with other people's winning team is not really supported by evidence IMO. Heck, from what I see, red vs blue has more of an effect than what other people got.