Nope. Gryphon card autocasts Level 5 BB at a mere 1% chance. And, you're much better off using Edge when zerking. Can't stress this enough. Edge / Guillotine = pwnz0rz.
And the main point of a LK isn't to zerk, seriously. You're supposed to tank and disrupt enemies at the frontline, with Magnum Break, BB, Provoke and such. Also, kill, to a lesser extent. And thus, you are absolutely required to pot. On Low rates at least, a zerked LK = a dead one. You'll find the normal unzerked ones much more of a pain in the donkey, trust me.
Well, it does work pretty well for emp breaking... >.> But, it's still much better to leave it to the SinXs who can break the emp in like 2 secs.
All zerk does is make you become extremely annoying for a while, really.