I like their talent and think each one has at least one trait to like very much. I think they all can start and that Randall might become a fixture on defense. However, neither their development or health is guaranteed. Its probably unlikely all three hit just based on those probabilities alone.
If Shields is done and Goodson is lost, you need depth and a chance to find talent. I not as sure about Dorleant as I am about those three.
If WR and ILB have taught us anything, a return to health is one thing, a lack of depth is something else.