The phrase "a sole point of" is correct and usable in written English.
It can be used to emphasize a single focus or aspect of a discussion or argument.
Example: "The report highlights a sole point of concern regarding the project's budget overruns."
Alternatives: "a single point of" or "one key aspect of".
Walter and David have a knockdown, drag-out showdown that could be Biblical or Homeric in its intensity and import but instead turns out to be a bland blur, the sole point of which is to set up a not-to-be-spoiled twist, when the surviving crew members get away aboard the Covenant to bring the still-dozing colonists and still-frozen embryos onward to Origae-6.
The sole point of a drug patent is to outlaw a free market in the production of a new drug for 20 years, thus ensuring far higher drug prices than a competitive market would ever allow.
Phillips is unambiguously a heroic figure, but he's scarcely the sole point of interest in a movie that steadily and almost stealthily asserts the agonized humanity of his captors.
Discounts of at least 20 percent are part of the business model, said Jason Seeber, a k a Agent Red, but are not the sole point of the site.
"But in 'Pi,' I was interested in making a fully subjective movie from the sole point of view of my protagonist.
Because defendants failed to prove their entitlement to summary judgment as a matter of law, we sustain plaintiffs' sole point of error.
Indeed, there are contexts in which a claim of genetic a priori (being independent of experience) is virtually the sole point of appeal to instinct.
Institute legal and law enforcement systems with a prime minister ostensibly subordinate to Arafat but the sole point of contact with foreign aid and security officials".
It is James's misfortune to fall into something agonisingly resembling love with Katherine, a thirtyish London underachiever who in her turn is tormented by an emotional state that would probably like to be love for Fraser, a red-blooded paparazzo who – and this is the novel's sole point of certainty – is definitely in love with her.
Braintree's focus on providing mobile developers with a payment platform may help it win over startups in emerging economies, such as India and Indonesia, where a rapidly increasing number of consumers rely on mobile devices as their sole point of entry to the Internet.
