"What I do not understand is; if we started off at the same time from the Big Bang and it took light 7.5 billion years to come here, how did we get here before the light? :-)"
We didn't! We were not here/did not exist when this burst occured. Apparently light from such an energy source has little or no bounds. Are you comparing this to a Big Bang event? The only thing I can think of is that the Big Bang must have been a sight if there was something or someone to have witness it at the time and maybe they have or will in some distant future (lol, yikes!). Thank goodness for microwaves.
"Whatever direction the remnants of that event are travelling, then they have had 7.5 billion years of time to go in that direction, so, how far are they now?"
We may never know the answer to that one, Johannes.