gsp has 17 fights in the ufc all of them after ufc 28. 7 of them ended in the first or second round.
they are averaging career ufc fights of fighters with at least 5 fights. not the last five fights of the fighters career. gsp would certainly top that list.
the more fights you have in the ufc the better chance you have of staying of these list.
oh and gsp lost two of those 7 fights that finished in the first or second round. this is why his fights last longer now.