In your words : Will it be possible to get a 3/5 player?
It's certainly possible, but I don't think there's data to show that it's as likely for a 3ball star rating player to turn out to have 5 potential after interview as for a 5ball star rating player, since that's the information you're looking for.
If you ask me, I'd think there's a slightly higher chance for a higher star rating player to have high potential, but that's just from personal experience and gut feeling.