Agree, we should hold onto him. I think he is ready to explode next year. Whilst he doesn't have the brilliance of Buddy, he most certainly has freakish agility and speed for such a big bloke. Something Buddy had, but is progressively diminshing.
Brisbane would take a straight swap, Longer for Grimley, if only it was put on the table by the Hawks.
Right now, Grimmers has more value than Longer. Especially to Brisbane who need a new focal point in attack. Don't undersell Grimmers.