Do you get the most out of relationships? If not, consider giving people 100% of the credit they deserve in their role.
Trust is earned. Having to prove yourself gets frustrating, not exactly the quickest route to a mutually trusting, beneficial relationship.
Assume people have already proven themselves in being offered and accepting the position will start the trust wheel moving forward.
Don’t worry, those people not worth trusting will lose chunks of the 100% credit quickly, but you will no longer stifle great relationships from starting.