Disruptor rush would suck really bad. I think it would work better if it would work like echolocator, but that might not be balanced either...
Anyway, I really want another burst bomb/echo weapon. Imo, it was a missed opportunity to give the PG a kraken. echo would make it less outclassed by the custom jet and it would make it stand out more.
A disruptor/inkstrike combo would be pretty fun, since you could basically guarantee an ink strike splat if you disrupt your opponent first.