No. Specialised knowledge does not have to be unique or narrowly held. An advanced-knowledge claim should nevertheless establish developed understanding of the organisation’s processes compared with other workers in its operations.
Use an accurate comparison
Identify the relevant capability and evidence rather than declaring the employee the company’s best expert. If several people share the knowledge, explain why the U.S. role needs another specialist and what the transferee will do.
The petition must also establish qualifying foreign employment and the corporate relationship; a favourable internal ranking cannot replace them. Explain to the household what the claim does and does not assert, because families frequently hear it as a judgement about the employee standing. It is not.
The question is whether the role requires developed understanding of the organisation processes compared with other workers in its operations, and several colleagues may hold the same knowledge without weakening the case. Where they do, say so and explain why the U.S. role needs another specialist and what the transferee will do there.
Keeping that framing straight matters practically, since an employee who believes the petition rests on being irreplaceable makes decisions accordingly. The petition must also establish qualifying foreign employment and the corporate relationship, neither of which is affected by how the employee compares with peers.