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Wondered the same thing - why Walker and not Ramirez? He's hanging with Pryor, Patterson, Kinney and Marquez at cone 5.
Now obviously you can't read too much into this - maybe they just want Walker to stick close to the vets & absorb, but in my competitive experience you want to be grouped with the Paxtons and Hultzens on day 1 even if it's just a warmup & stretch.