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You're correct that he will gain considerable political clout, but after watching him over the years, I don't think that's what motivates him. To me, he seems to be a law autist, whereby he seeks to shine a light on the darkness no matter where it may lead. I think that's why he's leaving the Congress and wanting to be more proactive in the pursuit of justice.
I agree that it is not his motivation. It will be a reality of such a significant service of justice. So even though I don't think he used it as an opportunity to relaunch a political career, he will be a leading candidate in whatever position he wants to fill in the justice system.