I don't remember him playing particularly well with Okposo, but he does play well with Nielsen. Nielsen is a quick skater and is good on transition. They compliment each other well in that regard.
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KO and nielsen were his linemates in the rookie season once grabner emerged and okposo came back from his shoulder injury. I think to remember that grabner claimed okposo gelled the line together through his strong play along the boards and in the corners.