This also lets all of his co-investors in X, who were likely pissed that their shares tanked, exchange their shares at an inflated value (but one that still sees them losing 25% of their original investment) for shares in a trendy yet likely overvalued AI company that they consider to have more upside.

The other part of this is that if TSLA stock drops to $100-ish he'll be at risk of being margin called on the loans he took against his holdings to buy X. I wouldn't be surprised if this deal involves some X shares being sold for cash (that was raised from VCs) to pay down those loans, and/or the lenders agreeing to take xAI stock in lieu of cash.

This whole thing seems like a big pyramid scheme. I don't think this is the last time we've seen this type of move: he'll keep starting companies that are at the forefront of whatever the current hype cycle is, then leverage the extremely inflated valuations to benefit himself.