Elie is rated as a late second early third. Hes a top 6 forward next year on most teams. Platzer a top 9 and Jammes still an unknown. The thing about London is, that without making any moves, guys like Elie, Platzer and such are at best in their top 9.
They still will have Chris Tierney as a third line centre, who would be the top centre for the Colts this year. Guys like the Ruperts will still be second or third line guys, the defense will remain strong despite the loss of Harrington, they will still have two first round NHL picks on the back end with Zadarov and Maatta, plus others who will fill roles. They had the best roster this year, and have the most returning players. Griffith and Broadhurst will hurt, but they have the guys internally who can fill those roles. As of now (assuming that Broadhurst and Griffith are gone) they only have 1 OA spot spoken for. The selection committee doesn't look at it, but with the picks that they have and the 95's-96's that they could move, they could be outright scary.
Add in all the depth that they have in Jr A with guys like Santino Centorame, John DiLorenzo, Owen McDonald in Jr B. They are very, very deep.