the usually-at-7.30/6.30c Insider
Rob Marciano heads for GMA (he started out as a weatherperson, which I'm not sure they have post-Champion)...
Nope on the 6:30 Central part. Because 6:00 Central is full of local news, ET's at 6:30 in the majority of markets and Insider is wherever there's open space in the schedule. (Here in Austin, that's 12:07 AM, right after Nightline.) Similarly, Wheel of Fortune is a 6:30 show out here in flyover country and Jeopardy tends to be a late afternoon thing.