Combo Tree Symbols Meaning?

[that guy who's absolutely pissed off]

Does anyone know what the symbols mean in the combo-trees? I get that the blocky blue one is shield breaker but what about the red star and the yellow glow? In the instruction booklet it lists the red star as both "Big Score" (I assume meaning high damage) and "Special Move". I assume this is an error and the "Special Move" refers to the yellow glow, but what's so special about them?

[redridingshrek]

I have always seen the red star like a "smash" of some kind Like these attacks with the red star should be powerful or something.
The yellow one though... no idea.

[nebbii]

As far as I know the red spark means the move does a lot of knockback, I think the yellow glow means it does a lot of hitstun.

[A51 Trooper]

The yellow ones are special moves, but I honestly don't know any special things about them. We may never know their true purpose.