Anderson and Brown were desperation signings. They weren't guys we pursued during the offseason planning to make them a key player. Look at the guys we put significant resources into at the position: Todd Gurley (fast, explosive, and dynamic with very good receiving ability), Darrell Henderson (fast and explosive with receiving upside), Cam Akers (explosive and dynamic with receiving potential), and Christian McCaffrey (failed - explosive, fast, and dynamic with elite receiving ability).
McVay has a type. Pollard fits that type. Antonio Gibson has the skillset and potential to fit that type (college WR with 4.39 speed who is dangerous in space). Montgomery doesn't fit it. (And I like David Montgomery.) Devin Singletary doesn't fit that type.
Does Sean Tucker fit that type? Yes. As does Jahmyr Gibbs. But I'd rather not spend another premium pick on a HB. I'd prefer to use our second on an EDGE. As for our third, it seems like prime real estate for an OL.