I see your point, but you kind of have some wires crossed.
Omen was/is a bonus character. He was pasted together and inserted into the S2 ranks to bide time while they were developing other characters. He was sold to the community that way, by repurposing Jago and Sabrewulf’s moves.
Shadow Jago is also that way. Shadow Jago is an extra character that the community asked/paid for. Originally he was supposed to be a straight up Jago clone with Boss Jago’s moves, but IG went the extra mile and spruced him up A LOT more.
Mira…OK, you may have a bit of a point here. They did reuse some of Maya’s moves/animations here, but they also sold her to the community as the sister of Maya, who trained with her, and thus their fighting styles shared some similarities. In the lore they share a history, thus why they share some moves. Call that lazy or whatever, but that was the reason they gave.
Kilgore is seemingly much the same as Shadow Jago, or Omen; he, like presumably all of these new characters will be, seem NOT to be a part of a legit season, thus they seemingly would fall into the “extra” (even if we have to pay for them) category. I say all this with just speculation as we have no other details, but yeah, IG/MS DON’T do clone characters…as standard characters in the regular season. But bonus characters, extra/standalone characters, and/or whatever this here “3 new character pack” is/maybe are a bit different.