Beating Ennis does nothing for his legacy. Ennis has a shopworn Lipinets as his best W and only has a belt in the first place because Crawford dropped it.
Crawford should fight at 154 to establish himself there. If he can't get Tszyu or Charlo but he utterly dominates Mendoza or Castano, that will likely vault him into the top 2 of the independent rankings (Ring, TBRB, ESPN, BLH, etc) and set him up for a potential lineal title fight against Tszyu should the reigning lineal champion Charlo decide not to return to 154.
Crawford should fight at 154 to establish himself there. If he can't get Tszyu or Charlo but he utterly dominates Mendoza or Castano, that will likely vault him into the top 2 of the independent rankings (Ring, TBRB, ESPN, BLH, etc) and set him up for a potential lineal title fight against Tszyu should the reigning lineal champion Charlo decide not to return to 154.
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