This would be GROSSLY unfair if they are not doing it at IG!!!
I'm just basing my guess on the historical inconsistencies between operation of the IG and the MG.
In the example below,the MG opened at 8:45 AM,but we were not let in the IG until 8:58 AM-we watched Guests who had come all the way from the MG cross the English Channel Bridge headed to France for Breakfast.
Also,because Surprise Mornings are unadvertised by Disney,I just don't see them dedicating a CM to be at the IG at 7:00 AM just in case a few Crescent Lake Resort Guests have heard of the unannounced Surprise Mornings.
Hopefully I'm wrong.