I know I said I was done, but when you come w/ such dubious points I can't help myself. First let me say, if you think you addressed this in this thread on other responses, I apologize. I don't read the entire thread, just the OP.
1. False, there is nothing in the manga that states Yamoto's chakra was drained.
2. So why do you think it boosted the number? Do you think the power used to do that couldn't be focused into 1 zetsu? The zetsu's number was originally provided by Gedo Mezzo. Do you also believe the Gedo can't boost the power of a zetsu? Since when in the history of the manga has getting additional chakra NOT increased power? The 2nd point is dumb, because this isn't real life it's a story. I could say it was the same reason Obito didn't capture Naruto in the woods or in the samurai's country... shucks he could have easily got Naruto when he left the village on his first mission. However if I had to come up with something, the obvious answer is Obito NEVER wanted Yamoto, because he didn't really need him. Him being captured was just a bonus just like the edo army.
3. Or instead of that convoluted mess, with no manga proof backing it... we can say that they are failed experiments because they aren't perfect clones of Hashirama as Madara intended them to be.
4. I'm not sure how you define logic, but I don't think that word means what you think it means. Again, you are over-thinking. The "insides" comment was clearly talking about what's inside Spiral Zetsu, as HE was shown NEXT. Obito hasn't even been shown SINCE that comment. Then Kishi shows us there is someone inside SZ, confirming the comment was about who's inside SZ. The most logically connection is what comes after, not before... that's why it's called FOREshadowing. Why would there be a 2nd insides, THAT my friend is illogical.
5. Yeah, your theory that you re-post every week. I don't care about it and I'm not addressing it. I'm not saying your theory isn't valid, I'm only demonstrating the theory that Yamato is inside SZ is just as valid, if not more so.