Why is kyle busch in the 20 car right now?

May be...

Nationwide Series practice probably.

Busch was jumping in to relay info to the 20 team, and to help out the rookie Lagano.

im watching practice on speed and what the hell did i miss

Kyle's very good at communicating to a crew chief what the car is doing. He's helping Zippy get it to where it needs to be for Joey.
Joey doesn't have that experience yet.

Helping to set up Joey's car, in Cup, and driving the Nationwide 20, for the point Championship..looking to cheat