When Rodimus returns, after all is said and done. He will find a very special guest waiting in his room. How did he get in, does it matter? It is after all the Antlered King, the exiled Megatron.

The one who was told how dearly he's missed and ...some how found his way back to the ship?

"There... must be some questions." He says sitting on Rodimus' berth. "But before you do,"- he holds his hand up to say one more thing.- "I was wrong to run as I did, to leave you to watch another copy of me fade..."