Kasper is just every play-by-play man. They're all manufactured the same these days, so I don't miss him over Chip. Also, Chip got too excited about the other team hitting a home run and if I wasn't looking at the TV I could easily forget who was batting.
Brenly adds nothing to the broadcast, Stone was much better with analysis and calling it like he saw it, which ended up being his demise, as we all know. Brenly is a friend of Dusty Baker's, so that definitely plays a part in how he calls a game.
By the way, the Cubs really suck right now.