Oh that's why!

[RinneJoseph981000]

Have any of you noticed on page two of chapter 604 that Obito gained some height from the Spiral Zetsu shell? This explains why Obito had an adult figure when fighting Minato!

 

[Wang]

He grew because of the Senju DNA that was pumped into him, you can see him growing in the previous chapter. I don't think it's because of Poo Zetsu.

 

[XxTwin BladexX]

What Wang said. :|

 

[neilson]

i think your right!!! And you guys there's no proof that hashirama's dna is a growth pill, so its the zetsu that enclosed him that made him tall, but if thats the case it means that obito is very skilled at a young age