Role players ≠ bad players
Role players ≠ useless players
Every team needs role players. Seems like many on this board expect 5th year transfers to come in and lead the team in scoring ie Alstork last year.
Outside of maybe Starks, I think every single 5th year listed above brought value to their team. Alstork was frustrating, but Frazier is quoted citing about his veteran presence and influence being key to his development. Thorne was *really* good before injuries ate him up.
If a 5th year is brought in, eats up some rotation minutes, and does nothing more out there than allow your defense to switch on the perimeter against a P&R - guess what - that's worth having.