I dont think we can call Bell a proven elite back anymore. The last time he averaged more than 4.0 yards per carry, he was the league's 5th-leading rusher behind Jay Ajayi and DeMarco Murray.
Life comes at you fast at RB. Bell has some excuses for 2017 (no camp, absurd workload), 2018 (DNP) and 2019 (shitty line). But he needs to prove it again.