Joined: May 2016
Posts: 8,205
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I don't touch that trade from the MN side. Barkov is a rental+1 (same as Dumba), that's how they should be treated as far as value. Re-signing him or not has nothing to do with the initial trade value, it's why in years past there have been conditional picks for a player re-signing added to the trade.
His agent could promise he'll re-sign for a league min x 8 on his next deal and it means jack and squat because it can't be signed for 6 months. This isn't a trade-and-sign or sign-and-trade. It's a rental +1 and it's up to the receiving team to work out a deal or not when the time comes.