Don't let the books fool you, that man is Slytherin through and through.
"Slytherins tend to be ambitious, shrewd, cunning, strong leaders, and achievement-oriented. They also have highly developed senses of self-preservation. This means that Slytherins tend to hesitate before acting, so as to weigh all possible outcomes before deciding exactly what should be done."
As compared to Hufflepuff - yeah, he's definitely far from being a Samwise (sorry, I haven't seen or read enough Harry Potter to know who those characters are).
"I absorb energy like a sponge everywhere I go. It allows me to see the world and my purpose in it." Zak Bagans, Ghost Adventures (INFJ)