The Raiders opened Thursday night’s preseason game with the Seahawks with their starting offense on the field, but they didn’t stick around long.

Quarterback Geno Smith and most other first-stringers were done after one series of work, which head coach Pete Carroll said was by design in a Friday videoconference. Carroll said he wanted the team to go through the full preparations for a game and that the plan is going to be different when they face the 49ers next week.

Carroll said the starting offense will play “quite a bit” in that game, but he also cautioned that they aren’t going to be revealing much of what they plan to do in the regular season. The Raiders have a new offense and Carroll said he doesn’t want to let their early opponents in the regular season get too good a look at wha

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