SPOILERS AHEAD

I was going to put this in another blog. However, realizing it will be terribly overshadowed. I decided to make this blog to answer this question because to be honest, in my real life, I really don't know out of all my friends can answer this question. So anyway.

Fine, if this was "loosely" based on Ellis' Extremis story arc, I can accept why Hansen & Killian's characters & fates were different for movie & MCU reasons. However, that still doesn't answer the question of how could Tony control the MK 42 without having his "personalized" dose of Extremis?

Jarvis is essentially just a personalized computer so you maybe able to get away with some remote access for MK42 & for the Iron Army, but at the beginning when he, what did he do? Put holes in his arm? He wasn't upgraded by & didn't even know about the Extremis process. Tony Stark isn't a Doctor Strange or some sort of wizard... last time I checked anyway. How did the armor fly to him on command??? Please someone clear this up for me! Thank you, if you don't know what I mean. Then please read the comic or read the wiki page, hell even watch the marvel knights series of it on Netflix, DVD or however to learn more...

Thanks