I think we have all overlooked the point that a few years back, all ramp equipment not only had to set brakes and all that other good stuff but were required to carry chocks that were mounted on the vehicle and had to be put in place if the driver was not in the cab, such very sound procedures seem to be a thing of the past, this along with outfits such as Sun Wing seem to be a case for going back to such procedures. On listning to other tapes from CYYZ tower the call signs seem to be quite clear, so lets wait for the TSB report, can only hope its not long in coming.