If you`re talking about a roster you're using for your franchise, then it will have no effect on your roster. So, if you have started a franchise (with a created Suzuki) and maybe this week there will be an SDS roster update with Suzuki in it, this doesn`t wipe over your created Suzuki or any other player in the rosters in your franchise. So players in the roster in your franchise will only change if you edit them by yourself.
Hope I got it right and this answers your question.