Karinichenko had to succumb to the power of the dollar. Otherwise, why bother bringing Yang Yi here? He's already taken the first step, could he pull back in time?
Yang Yi knew Karinichenko had to agree; he couldn't refuse.
Why did they have to see the man whose bones were mostly shattered first? Why did Yang Yi insist on buying those twelve Alpha soldiers? The reason was simple: he had to let Karinichenko know that if the bearded man was unwilling to sell, there was no need for anyone else to sell, and the deal would be off.
But more importantly, the nearly dead man and those Alpha individuals were the main subjects of the trade. By buying them and adding the bearded man as a bonus, Karinichenko could earn a kickback from this transaction.
Yang Yi guessed Karinichenko wasn't the one in charge. Could someone dealing with prisoners from the Black Prison actually accompany Yang Yi to the jail personally? Therefore, at most, Karinichenko was just a glove puppet.
