Hmmm, the evidence doesn't really back that up:

AoE was released June 27th 2014. Here's some Generations first sightings in the US round that date which are currently at Page 80 and beyond of news.tfw2005.com/generations-classics/

7th September Jetfire Generations Leader Class Jetfire Purchased at US Retail - Transformers News - TFW2005
4th August Legends Cliffjumper & Nemesis Prime Generations Leader Class Jetfire Purchased at US Retail - Transformers News - TFW2005
30th July Sky Byte Generations Sky-Byte Found at US Retail! - Transformers News - TFW2005
12th June Rattrap Generations Rattrap Found at US Retail - Transformers News - TFW2005
28th May Tailgate & Skrapnell Generations Skrapnel and Tailgate sighted at Target - Transformers News - TFW2005
29th April Swerve & Cosmos Generations Swerve and Cosmos Found at US Retail - Transformers News - TFW2005