In my opinion the shares traded back on 9/28 was not front loading. Front loading usually is subtle and happens before the herd comes in.
Usually, that type of volume that was on 9/28 is a note holder converting. Look how the volume drops off the rest of the days following 9/28.... def note holder imo.
I don't believe there will be a RS... imo it would have happen by now.
As for a buyback... I think if one would happen it would take place after the filing.
I'm basing this on my past merger plays, so yes something could be different from what I stated.