Indianapolis Star Motorsports Reporter Curt Cavin has followed the ins and outs of Indy car racing for 25 years so he was the perfect person to explain the next round of changes in the IndyCar Series. Those changes are rooted in the departure of IndyCar CEO Randy Bernard who left the series Sunday. It's unclear if he left or was asked to leave but his departure leaves a big hole in the series' future. We learn some of the background on the changes, the impact of the changes and what might be done to keep the changes from damaging the series. Listen…