According to that narrative, the crown prince had approved an interrogation or rendition of Khashoggi back to Saudi Arabia, but the intelligence official was tragically incompetent as he eagerly sought to prove himself.
Turkish officials believe Mr Khashoggi was murdered by Saudi agents but Riyadh has always strongly denied this.
"Saudi Arabia is one of the most lucrative foreign markets for our defense contractors", said Todd Harrison, a defense analyst at the Center for Strategic and International Studies.
Saudi Arabia agreed last week to allow Turkish officials to conduct a search but insisted it would only be a superficial "visual" inspection.
The Saudi government has repeatedly denied any involvement in the journalist's disappearance and in a statement Sunday warned that "if it receives any action, it will respond with greater action".
Already, global business leaders are pulling out of the kingdom's upcoming investment forum, a high-profile event known as "Davos in the Desert", and the sell-off on Riyadh's Tadawul stock exchange showed that investors are uneasy.
Even Trump's principal factotum in the U.S. Senate, Lindsey Graham (R-SC), has said there would be "hell to pay" if the Saudi government is proven to have killed Khashoggi.
The government critic vanished on 2 October after visiting the Saudi consulate in Istanbul, Turkey.
Erdogan and Salman discussed "the issue of shedding light on the case of Jamal Khashoggi" and also emphasised the "importance of creating a joint working group within the framework of the investigation", said a Turkish presidential source, who asked not to be named. Trump's argument that any such curtailment would entail a US economic sacrifice and would only open a market for Russian Federation and China to exploit is phony because his claim of securing $110 billion in military sales to Saudi Arabia is also phony.
The kingdom seems to be taking on each challenge one by one, beginning with Turkey where the macabre incident took place. A spokesman for JPMorgan confirmed chief executive Jamie Dimon will no longer attend, but declined to say why.
Last year, MBS told Reuters that Blackstone and BlackRock Inc were planning to open offices in the kingdom.
Khashoggi's alleged murder at the hands of Saudi operatives - something the kingdom has vehemently denied - is just the latest in a series of events raising the temperature of the kingdom's diplomatic relationship with many Western nations.
Ford Motor Co Chairman Bill Ford also pulled out, as well as media organizations like CNN and Bloomberg which once served as sponsors of the conference.
Similar campaigns trended on social media in Saudi Arabia and the United Arab Emirates.