My basic readings off Buium is he shouldn't have any notable issues defensively; no he's not 6'3'' but I find his base (positioning and east-west skating) is good enough to work with at the NHL level.
Parekh is the bigger gamble. The defensive engagement does scare me sometimes, then again Saginaw has an intriguing style (Mintyukov, though a different projection, also had detractors for his defensive game). With limited information available, I peg him as a risky wildcard; with first hand knowledge of his work ethic, smarts and character, he could be an inspired selection.
If an NHL organization is satisfied with his character and thinks he can AND will work on his defensive game, then I would understand him going very high, top 3-5 even.