I'm not sure you understood what I said...
Currently in the lore they've defined it so that egis constantly take a toll on our aether whether or not we currently have them out. Using that logic, we should be able to have two or three different egi out at the same time since they're draining me at the same rate anyway. So my point was that they introduced a plot hole by defining summoning in that way.
The fact that we originally we're going to get more egis but they changed their mind means that lore is just up to the whim of the developers and in the end it's just game design. I just think it's bad game design since it doesn't portray the image of a classic Summoner the way the other jobs portray their origins...