If you read the interviews from the Development Camp, it seems as though the kids are all aware and excited about the 1 open spot in the top 9.
I think it would be silly to sign/trade for another top 9 winger because then there will be no incentive for the young guys to work hard in the summer and battle it out in training camp. Give the 3RW spot to one of Frost, Farabee and Ratcliffe based on their camp performance. Realistically the first 3 lines will be relied upon for scoring, so it will not hurt any of the kids' development