Kayn/Rhaast Name in Chat

So I was playing Kayn and I was just wondering why Kayn's name doesn't change to Rhaast in the chat when he transforms. We already have alternating chat names for other champs like Gnar/Mega Gnar and Anivia/Eggnivia so why don't we have one for Kayn? It makes the most sense if you think about it cause when Rhaast takes over, there is literally no part of Kayn left. One needs to completely destroy the other to take over so when Rhaast is reborn, pretty much everything about Kayn is gone. Considering this, it feels pretty weird to have Kayn's name in chat when we transform into Rhaast.
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