Points can indeed be saved through following seasons.
Be aware that potential means less if the starting skills are lower, because you are unlikely to fulfill the MVP potential of a 1 ball star rating player. I generally don't find it worth it to interview 2 or 1 ball star rating players, and usually I skip the 3 stars too.
Very true. Good observation.
I'll start by interviewing the 7 4-ball players I've got after the Group demonstration and Scouting combine. I got 8 5-ball players who have all been interviewed.