Re-watched TF:TM for the 22,357 time yesterday (it's a Xmas tradition) and realised that when (spoiler alert for those 26 years late to the party) Prime died and handed Magnus the Matrix, it just slotted straight into his chest like he had a spot reserved for it which got me thinking... are all Transformers built with a cavity in their chests to hold the Matrix if they become the Chosen One?