What is the probability that every role on your team loses lane excluding yourself.

0.5^4 = 0.0625.

Math smath.

In my experience it's damn near 100%

50%, junglers can single handly win all the lanes for them.

don't say that all you have to do is play safe, most champions cannot farm safely and people in worlds still pick the safest champion and still die to ganks.

I have seen people 1 v 5 carry a game (in lower divisions). But.. and it is a big but (and I cannot lie) the people that are losing have to lose well. They have to know how to lose thier lane without allowing the opponents to snowball out of control. Then get out of laning phase and win the teamfights with superior positioning.

Players at lower divisions typically have different strenghts and often glaring weaknesses. Like you know how you get that vayne on your team that is mechanically skilled by is always always getting caught out randomly on the map. Great mechanics awful marco and map awareness. While I am not particularly mechanically skilled whille I feel I have a good understanding of marco and I have been improving my positioning. You might random role a team of all mechanically poor players that have excellent understanding of marco, so if you can hold off the snowball (and tilt) you can get back into the game.