Moving manually created user to SAML

HI, 

I am just in the early stages of rolling out Zoom One for our company and I have a question on managing those users. 

For new users we are looking at using SAML and I am happy with that process, but I have a few people who need a license to have longer meetings and I haven't got the platform fully set for those, it had me wondering can I manually create and assign the license for these users now but later when ready add them to the SAML at a later date or will Zoom create or overwrite the existing account. Or will it just error out and cause an issue for the users?