I'm no expert either, but insider trading is defined as trading on material, non-public information. It'd be hard to argue that Kruger didn't have material, non-public information last week (i.e. he has to know what last quarter's results were).
Most companies don't allow insiders to trade during the time between quarter-end and the earnings release.
I thought the early exercise of the options was significant because that type of transaction isn't governed by insider trading rules...which means he could have exercised his options even if he had material, non-public information.
I don't care one way or another...I'm just trying to figure out what the purchases could mean. I'm probably over-thinking it...I guess we'll know on Thursday.