Player Leads and Feeding Players -

Ok..... so I have had multiple games where the same thing happens again and again and of which it just becomes predictable, I win jg almost all the time bit still lose the game due to team mates deciding to feed their ass off. In general being able to transition a lead to other lanes is good in the right hands but why is it that I can get the top and mid laners stupidly fed though the bot lane can feed their ass off and lose us the game?. Here's an example of a recent game.

My Team - Top Panth vs Riven JG Ivern vs Amumu Mid Zed vs Jayce Bot Jhin vs Vlad Sup Alistar vs Xerath

To start this off at 5 minutes jhin and ali have a combined death of 4.... so it becomes literally impossible to gank their lane so I go top get pantheon 5 kills, gives him a massive lead, then I go mid and get zed a few kills. While this happens jhin and ali has died another 2 times..... great although the amumu has done absolutely nothing at this stage of the game. I then go bot a few mins later, no one has a full item bot btw and I go in and jhin flashes and dies..... ints and proceeds to blame me for running it down. Then amumu finally turns up and gets a kill on ali. Amumu did nothing.

The game goes on and now the Riven is getting kills for no apparent reason and goes 5/6/3 at the end of the game. How?, Vlad then manages to get 4 items while jhin and ali have none... great. Then we lose. The problem here is that I have transition this lead to all my lanes except bot bc obvious reasons although they keep feeding the enemy team causing us to lose. It doesn't help that my MMR is Silver IV bc of these players. I get 10 LP on winning and 22 on loses. Amumu happened to have a better score then me at the end of the game by doing nothing.... just unacceptable he was the worst jungler I probably played against and he won....

Here's my profile - https://oce.op.gg/summoner/userName=Gliave