As promised, I have escalated the case to our casino management team and they came back to me with the below, which I have pasted, split in 2 sections, to answer the two topics you have brought up in this post
Casino Tournaments Leaderboards
1. Same players winning the tournaments, are also the players with the highest rebuys and what happens is that we do not have the functionality to limit a players rebuys into these tournaments. So what these players do is they keep on rebuying when they lose their credits and play until they get a good run. In often cases than not, these same players rebuys are higher than the actual prizes they win. All tournament winners, wins and high placings are checked and verified by relevant teams.
2. Tri-Card poker is a RNG game with a certified RNG engine thus we have no control over what the dealer or the player is dealt. It’s totally random and the frequency of the cards/hand dealt is 100% unpredictable for obvious reasons. This was just the way the cards were dealt for those hands, the cards could just as easily been dealt to the player. This is also one of our popular games and we never had any issues or complaints about it.