A low win rate champ team can never beat a high win rate champ team.
A team of
will always beat a team of
simply because they have better numbers and are way better in their respective roles. Games now more than ever are decided in champ select.
I'm even willing to say that team 1 played by silvers can probably beat team 2 played by golds.
etc. would obliterate team 1. In fact, team 2 has more synergy because they have 2 long range carries, an off-tank and full tank that are not gold hungry and a strong peel support AND they have more CC and mobility. However due to them being number nerfed to hell, there's nothing they can do vs. team 1's superior numbers.
Lowest Win rate champions in Gold: