Senior Bowl practices are public. Anyone can go. So it’s not a leak.
I will say them actually wanting Herbert won’t shock me. There isn’t really any reason to do much research on him. He has been a starter for 4 years and his character is well known. Apparently Dodd’s followed him around at the SB also.
I might be wrong but I would bet the leaks aren't coming from Colts employees. Most likely reporters and scouts seeing for themselves the apparent attention Love is receiving from the Colts. I would suspect just a case of them putting two and two together.