At first, here is correspondence with Lauda and marlboroza and i wasn't tagged by them - https://bitcointalk.org/index.php?topic=1702409.1380
You weren't tagged because having multiple accounts is fine.
But cheating in bounties with them is not.
It's very strange to send something to one address and then send it back. As for me.
It is also very strange that you allegedly invited him into this forum while not having an account here at this time.
Different addreses
Different addresses which sent tokens to the same recipient later.
different campaigns
There is literally proof in the OP, that both accounts joined the same campaigns.
different level of English (my friend is C2/C1 level, and i'm near B 
)
)C1/C2 ?
I wouldn't consider the following C1 (by far not):
There are plenty of meaningless coins on the market and they don't even worth mentioning on any kind of platform.
More like B1/B2.