Hi Ecka,
Unfortunately I don't think this will make a difference as per below.
*When you recommend The Platinum Edge Credit Card to a friend, you may receive up to 10,000 Membership Rewards points if they choose to apply using the link provided and their Card is approved. Your friend will receive up to 15,000 Membership Rewards points when they spend $500 within the first two months of Cardmembership. If your friend has already applied for The Platinum Edge Credit Card without using this recommendation, you and your friend will not be eligible for the bonus Membership Rewards points. If your friend already has an American Express Card, you and your friend will not be eligible for the bonus Membership Rewards points as this offer is not valid for upgrading Cardmembers. Please allow 8 to 10 weeks for the Bonus Points to be awarded once approval is made. Offer expires 31 December 2013. Subject to the Terms and Conditions of the Membership Rewards Program.