Littler Speedier Snakes/Death without contact/Same player using more than one snake

Three questions that need to be corrected within the game if the answers are true: Whats the reason why the smaller or thinner snakes much more speedier when my snake is about the same size or a little bit bigger? My snake dies every time with these. WHY does my snake die without even coming into contact with a close snake? Lastly, are there any players out there using more than just their one snake to eat another or are there two players working together?

Ground Cutter about slither.io, v1.4.2