So just questioning how power armour actually gets its power from a core.
Take a look at the core:
http://i.imgur.com/TTsvdPN.png?1
Makes sense. Plugs in and power comes out from the contact points.
But look at the port for the core. Its hollow. You can see the inside of the front of the suit...
http://i.imgur.com/1wY9EXt.png?1
There is no contact point where the cores outlets meet the suit itself. If anything it just plugs into your back.
But thats just me nit picking and looking to deep into the "WHOO YEA POWER ARMOR".
Concept believability > Concept gimmick
And heres what it looks like with no power core in the suit with a companion in it.
http://i.imgur.com/SdzXNPO.png?1
(Please do not get me started on the whole companion doesn't even need a core to power the suit...)