1st bold is wrong, obito used kurama to instigate the massicre because only uchiha could control a bijuu the way obito did, and no uchiha were present during the attack (busy planning the coup). Could've sworn manga stated it somewhere but i cant remember.
you misunderstand, obito
did want minato dead or at least gone
You must be registered for see images
This proves that obito wanted to warp minato away, therefore he wanted to get rid of him. Do you deny this?
lol the 2nd paragraph was me just exaggerating a bit. However your forgetting all the preparation it took obito to do what he did too. IA moron wouldnt be able to sneak into the leaf's most top secret barrier and extract the most powerful bijuu without so much as breaking a sweat. He didnt just walk into konoha and ask his former friend where kurama is kept hiding. Ill admit minato had better battle smarts and reflexive thinking but obito just had him beat, theres no denying that.
last paragraph, okay, you would still needed to get
access to the presedents family, and considering all the protection somebody of that status would get, I would 100% disagree and say that it would take a man of incredible genius to sneak through that kind of security undetected.