After a monstrous stock rally following November’s presidential election, Tesla (TSLA) reported its first annual decline in electric vehicle delivery, highlighting the growing disconnect between its high-flying stock price and its core automobile business.

The analyst also noted in a CNBC interview that Tesla owners paying the additional $8,000 upgrade for existing vehicles to adopt FSD would result in a big boost in profit margin. That would help provide a return on the huge amount of capital Tesla spends on artificial intelligence (AI) infrastructure to develop FSD.

The shares dropped more than 6% to start a new year of trading after the company reported weaker-than-expected fourth-quarter deliveries.