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1. Pretty sure enhancements were ruled to be unique, meaning same name = same card for T1 purposes. (You can't have both Gib Tricks in the same deck, for example)2. Yes. You can even discard them from hand to Uzzah.3. I believe no. The hero will go back to the main battle after the battle challenge, and never actually leaves the field of battle.4. Yes. But the Liners are banned now. So don't play Liners in your OH States deck Nic 5. Yes. But be careful, if the ability searching for the Dual-Alignment card puts it in play as one type, you have to put it in play as that type. Example: Eternal Covenant putting Joab in play - Joab can't be a Brown EC, he has to go to play as a Red hero.6. Can you give an example of a card that says "Take" but doesn't specify the area of where to take it from? And yes, Take is the new Search.
No. Because the character is moved to a side battle, they are still "in battle" and thus do not meet the trigger for SI.