So... given everything, the "four vehicles" (that were seen) have OR haven't been excluded ? I am non the wiser.
The situation is, how did he move from that area, if indeed he did move from that area, at that time...or a time later than that which has become the "target time" ?
The "extension of the time window" is therefore curious.
It is essentially saying, Corrie was moved "later" than the time at which he arrived into he horseshoe area.
By "extending" the time window... and so "excluding" the vehicles seen there (3x Cars 1x Bin lorry) within the "initial time window" we have the curious position that Corrie did not leave that area until very "much later" ?