Ok, so I saw this video online where a guy hooked up 4 chargers to his MBP and damaged it. I was under the impression that if you attached more power sources to it, it would selectively use just one - but now I'm worried it may get damaged. Now, obviously I don't plan on attaching several chargers to my MBP, but there are certain devices that may supply power to it. For example, I plan on getting the new Cintiq Pro which is basically a screen that has its own power supply (that also connects via USB-C) and connects to the MBP via the USB-C cable. Or, similarly, if you have an USB-C monitor, like the new LGs, that also charges the MBP, but you connect it while the MBP is already charging via its own charger - that's, basically, two chargers connected to the MBP at the same time. Any cause for concern?