49ers need a good back up for next year. Both Dobbs and Allen are FAs. I thought bringing in Fields might be a good idea especially if they don't extend Purdy right away and have him play out his last year. They can franchise tag him after next season as well so that would give them a couple more years where they can decide on Purdy but also bring in more of a project with high upside that you don't need to spend a high draft pick on. But I think Fields will get a starting job next year with someone.