Those aren't plot holes man....
Yoda - Obi wan training thing...Well you've explained that yourself, so no holes in the plot there...
Obi-Wan "took it upon himself to train him as a Jedi" - Which he did....I don't think that was the right time for Obi-Wan to tell Luke his life story....not with the big battles, and Death Stars going on an shit!!
Again....
I'm sure George Lucas knows his films...He did right them in the first place.....
Ok, so he's changing them....So...
He's not changing them so much that it's full of holes...
No, now he's just adding to an already great story!