I'll try to explain, but you have to be patient with my English.

There are hidden numbers behind each skill called modifier that determine the output damage of each skill. What we know about this modifier is that it varies between different champions, different skills, and even between different hits in one skill.

In most cases it is initially lower as you develop your champion, and when your champion hit 6/60 his modifiers (just like some of his base stats) increase to some extent. I'll give you an example.

Your Elhain has three skills. Her second skill (we call them A1, A2, etc.), so her A2 shoots one arrow first, then shoots arrows at all targets. You may have noticed (if not, try noticing next time) that the first arrow does more damage than the each arrow from next multi hit. How is that possible, it's same skill, just different hit. This is where this hidden multiplayer comes into play. The multiplier behind first shot is 6.3 when not fully leveled and 7.7 when she is fully leveled 6/60 and for second multi hit is 3.5 and 4.4 respectively.

So one of the main reasons your Cagebreaker hitting for less damage might be the smaller modifier of his skills (of course, considering all the other possible conditions such as the stats difference between the two champions, crit rate, crit damage, different target and so on).

I don't know Cagebreaker's modifiers and i don't know how correct is your observation, I'll just assume you are right, all other conditions are the same and in that case that may be one possible explanation.

I'll try to explain, but you have to be patient with my English.

There are hidden numbers behind each skill called modifier that determine the output damage of each skill. What we know about this modifier is that it varies between different champions, different skills, and even between different hits in one skill.

In most cases it is initially lower as you develop your champion, and when your champion hit 6/60 his modifiers (just like some of his base stats) increase to some extent. I'll give you an example.

Your Elhain has three skills. Her second skill (we call them A1, A2, etc.), so her A2 shoots one arrow first, then shoots arrows at all targets. You may have noticed (if not, try noticing next time) that the first arrow does more damage than the each arrow from next multi hit. How is that possible, it's same skill, just different hit. This is where this hidden multiplayer comes into play. The multiplier behind first shot is 6.3 when not fully leveled and 7.7 when she is fully leveled 6/60 and for second multi hit is 3.5 and 4.4 respectively.

So one of the main reasons your Cagebreaker hitting for less damage might be the smaller modifier of his skills (of course, considering all the other possible conditions such as the stats difference between the two champions, crit rate, crit damage, different target and so on).

I don't know Cagebreaker's modifiers and i don't know how correct is your observation, I'll just assume you are right, all other conditions are the same and in that case that may be one possible explanation.