If you are going to create an alt account to say things in this thread, which is totally legitimate, you might as well make sure you get your point across.
Who asked you if saying something from creating an alt is legitimate?
What's not legitimate is calling someone an idiot then denying the fact you said it.
If these players are all the same person, then it would make no sense to go all in against yourself, as the goal is to get chips from other players.
The accounts will go all against each others when there are no more players left except the accounts.
The strategy can be swapping chips between each others too to make other players weaker in chips.
All depends on the development but the first goal is always keeping all three accounts alive so that they can have the top finishing spots to maximize their profits.
This also makes it easy to cashout cheated winnings from a single source.