With no deaths and straight farming

Bot lane, on average, will be 1-1.5 levels below their solo laners and junglers will be 0.5-1 level below their solo laners. I honestly just thought about it and thought about how absolutely insane that actually is. In past seasons, under the same circumstances, bot lane use to be about 2-3 levels lower than their solo lane equivalent and jungle about the same. I'd say 1.5-2 level differences.

I think in addition to lane strengths, you should look at overall exp distribution and decide whether TWO people sharing exp in one lane should be so close in level to the solo laners. If played correctly, 2v1ing use to be a possible thing. Now that's just a pipe dream.

Added: The same for jungle exp distribution as well. Previous seasons allowed weaker junglers to shine through some parts of the game (I'm talking player wise) if they weren't good at the early. Now, if you have no clue how to play through the early in the game and the enemy jungler does, the skill gap is too huge to close for a team. Because you're down one of the two bigger impact roles. You can't have crappy bot lanes AND a crappy jungler on the same team. The moment you do, you might as well ff at 4minutes. Because you WILL tell by that time period.