Congratulations, in 3 years on this board I've never once put someone on ignore because I usually like to hear what others have to say even if I disagree. But you are the first. It was a feat, you should be proud.
Thanks for that, your pedantry was becoming tiresome.
I think we both understand the mechanism of side chains. For anyone else reading this I hope they aren't further confused by your explanation.
The block chains are the ledgers, there are as many ledgers as there are block chains. Side chains create new block chains, each with their own ledger which are reconciled through what is being called a 2 way peg (though that is also an inaccurate term for the mechanism).
Merging ledgers would be a destructive process where one block chain would then be abandoned afterwards. I don't think you are meaning that is what is happening, because that would be incorrect.
I know gmaxwell likes the term 2-way peg from his explanation of this last December, I didn't much care for the term then either. It is a useful shorthand, but it is going to confuse folks once this stuff catches on.
It is probably important to recognize that these are different units of account as well. Otherwise there would be no need for the SPVs (and the term peg would be completely meaningless if there were only one unit of account).