Total rubbish? I say "could've" and "part," and I stand by them.
He spent time out east where Sauron and Morgoth had influence dating back to the First Age. There's nothing contradictory about suggesting he could've picked up certain arts - even specifically some of Sauron's arts, as you say - or just mentally came closer to succumbing to his own desire of power.
He was gone a thousand years. Don't think he was playing Bingo that long.
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...take counsel with thyself, and remember who and what thou art.
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