K.O.D
No lights please
I would say knowing about Kazoo makes more sense his power level is natural and I double a few dozen meters of rock and some steel n plastic will hold it off. But meeting him would be hard...at least in the past it is considerably easier now.Also that which applies to Nolan would apply to Kazoo. Would no doubt feel the power. But being locked in Area 51, I'm not sure Kazoo would really know the guy.
Not got going to force any contact from me! Just setting up some possible options.
If left to his own devices, Master Dashi wouldn't really have a way of contacting the Saiyans. Though he would make his way to the Earth location that the ships are above. Where he would be hoping to see what they are up to should they land there. Probably disguised as something weird.
Nolan on the other hand does often wander around the world looking for interesting things in his down time so they could certainly have met in the past.