Oil through or not?

Being those Comp rockers come with ball adjusters it’s pretty much a no brainer. No need to also oil via the pushrods. I’ve never seen off the shelf cup/ball pushrods that oiled. Custom sure. If you swapped the ball adjusters for cup adjusters in order to use oiling ball/ball pushrods you’d definitely want to somehow plug the holes in the adjusters on the top ends just below the hex sockets to prevent having 16 geysers spurting oil onto the valve covers. You lose a little on oil pressure as well if running shaft and pushrod oiling.