Each of those is critical to the Rams bring able to manage their cap and have good depth. And in pretty much every case they are not even being asked to start but rather be solid rotational players.
Long- CB3
Hopkins- TE2
Jefferson- WR3
Howard- could compete to start, or be the 3rd ILB
Burgess- same, could compete to start or be the 3rd safety
Lewis- probably has the best opening to start but even a consistent 25 snaps/game from him would help.