Hey there!
Short answer is, It should be the up-to-date roster.... before starting a franchise season just go into Rosters on the main start menu and double check you have selected (&downloaded) the latest roster update as the default.
I know I've been caught out like that before in previous titles
Otherwise the other answer is that he's not in the game.... apparently there are a few prospects missing. I remember Dylan Larkin was some time back.
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