Hendricks won't come close to beating GSP. Heavy handed wrestler? GSP has fought like 75% heavy handed wrestlers in his career. It's literally his specialty.
Someone like Maia is the only guy with an interesting style and drive to pose a threat to GSP. A guy with Sonnen like aggression, good take-downs and great off his back, add in a good chin and relatively good striking and he's a really interesting matchup.
But a boxer wrestler like Hendricks? IMO Hendricks is just a younger Koscheck, which was proved more or less in the very evenly matched SD fight with Kos.
sig credit to Limba