Genjutsu tied Kurama to Obito, edo tensei's bind is controlled by a talisman not the summoner himself, thus killing the summoner is useless as the corpses maintain their same attributes. This is the same reason why unbinding it, IF POSSIBLE, is useless
Sealing Obito broke the genjutsu, the contract, that allowed Obito to summon him in the first place.
More like Iphone Pro to a normal one really, there is not that big of an advantage in FTG when Tobi knows how it function by heart, an thus can use his other superior attributes to close the gap and gain advantage.
Okay so the entire translation of Izuna=Madz comes from this user. Either take their new comments at face value or toss away the old translation. There's no other reference to this parity of power between the brothers.
You're reaching for scraps here. Even if Madara is slightly stronger, which is most likely true, the context is what matters. The panels themselves show how they're very close in power.
Minato has nothing on Tobi except a slightly superior FTG that won't even grant him as big an advantage agaisnt your average shinobi.
Unless you mean kyuubi chakra Minato then fair.