The Arizona Cardinals re-signed running back Chris Johnson. Does it mean anything for David Johnson? What does Mike Williams’ injury mean for Tyrell Williams? David Johnson https://twitter.com/AdamSchefter/status/888113849886322689 While re-signing a 31-year-old RB may not seem like a huge threat to someone as talented as David Johnson, it may be more of an issue than you think. While we all know that David Johnson is amazing, it is obvious that Bruce Arians still…...