Actually, I'd respectfully disagree. If your deck is big enough to win via deckout, your SoSas might get spread out enough that you don't draw them in time. I suspect that this is why the light deck failed so hard; it was 60 cards. If it had kept the same theme but been 35 cards, it would probably have improved. Most successful SoSa decks that I've seen rely on poison, whether monodeath, physalia, or dune scorps, because poison can only be removed by 1 card, purify, and so there isn't a need to 'protect' your win condition with PA, quint, etc.
And yes, lately I have used SoSa a lot, because I'm trying to prove that even with a stupid deck, if 6 SoSa are included, it's still a contender, and except for that joke of a light deck, they've all done reasonably well, and the physalia one even held the #1 spot. For the last couple months, I've been making creative decks, as opposed to winning decks, although some have been both. The only one I actually remember copying directly from someone else's post (zse) was a gravity/dark duo back in August. (I remember because I left it up over my vacation) There aren't a lot of ways to do monodeath or immorush or whatever, but they were still built from scratch even if they look similar to other people's.