@Pirouette What is an Ausländer?
I think I know what you're talking about here, and I'm also pretty sure that they weren't talking about chakra reserves, but chakra manipulation (because without it you can't be a ninja unless you have plot). The Uzumaki clan is the only family that we know about that has chakra reserves as a clan trait. Of course, if you are born in a ninja family, you're bound to start your ninja training at home and as you practice I believe your reserves will quite quickly outgrow that of normal people.
This really doesn't make any sense, and I've met similar arguments in many games before. The thing is that your skill in a certain field is measured by the amount and ranks of techniques in that field. Almost any ninja is able to perform generic fighting with pretty much any weapon, it is the techniques that sets them apart, that lifts them above the rabble that hasn't trained enough to acquire sets, techniques, jutsus, katas... Call it what you want. There have been instances of people who are pretty much shit in a field to still overcome an opponent using those skills, but that is mostly more about serving the plot, or the fact that they are both worthless in the field.
I still don't get it. Who wouldn't it make sense for her to be in Gobi before the birth, but practically immediately after is ok? Is there some event or circumstance you haven't told us about?
I actually like that you have a plan with this. What kind of engravings are we talking about? Will your and MMGiru's character fight for supremacy?