I think to an extent his being a dino-geek made sense in series 1, because after all, he was Cutter's student, and presumably studying/interested in such things. So it would be logical for him to know a fair bit about them, and for him to show off these skills - Cutter is teaching him; he may know everything Connor knows and more, but he'll let Connor have some of that limelight in order to help in learn/refine his skills.

In series two he's presumably no longer a student, and they've toned down the geekery a little, though not entirely eliminated it - Cutter will still expect Connor to make a suggestion as to waht a creature or a habitat might be, still maintaining a certain amount of teacher-student relationship with him.