Merit exchange? Is there any evidence that they are alternative accounts?
No. There is no evidence of that and it's pretty clear they are not alternative accounts.
But generally speaking, if I send you 10 merit and tell you "I sent 10 merit to you and now I don't have any smerit. Can you please send me 5 merit?, it would be still merit exchange.
But we see that this is important for the OP; maybe he has a nervous breakdown; I read his post history.
I agree with you. I also took a look at his history and just sent him 6 merit.