I watched Plainfield play Tri-West this year in-person. A few costly turnovers at the start of the game proved to be fatal the Quakers chances of victory; the Bruins capitalized off of all those turnovers and jumped to a 19-0 lead at the end of the 1st. Slowly but surely, however, the Quakers inched back into the game and even took a 20-19 lead. However, TW scored on their final drive and won 25-20.
I think that turnovers are the key difference maker in this game. Once Plainfield got going, the Bruins had trouble stopping them, and GS definitely has a better offense than Plainfield. GS has also been great at not causing turnovers. As a result, I like your chances, GS posters.