[r_smart]

> I'd say that not having 360 degree vision is a terrible shortcoming

Well now you're just being silly :)

>Do not underestimate the power of a takedown to the cement

I'm aware. I practiced Aikido for 10 years and BJJ for a year. BJJ doesn't really practice throwing with power, rather, it's usually a setup to disabling through grappling techniques. While I would readily admit Aikido is less martially effective overall (fairly tied to the traditional attacks & style of Japanese martial arts, which are often not practical), something that is explicitly trained for is fighting multiple opponents, throwing people into other people and throwing with power.