Yeah, this version of Jack is definitely less hard-headed. A lot less set in his ways. And with a lot less of a hero complex. Sure, he believes he's doing an important job when he's hunting down time criminals, but it's not the be-all and end-all it will be when he's a century and a half older.
Right now, he's a lot more flexible - in almost every way.
He studies Spike with interest, trying to figure him out. "How about if I ask you?"