I think Robz is pretty much wrong all around about the Rebuild game. The engine is extremely strong, as Jack let's you recover your economy almost immediately after trashing with Chapel. The FV/Jack synergy is strong, and then you get your draw/attack/buy in one nice card (Margrave), what more could you possibly want? The engine doesn't even need to double Province, realistically it just needs to do Province + Duchy a couple times. AdamH is already producing $11 with buys on Turn 7, that's pretty darn fast.
The game isn't even very close. It looks like only a 4 point win, but Psyduck's deck has capped out its scoring capability at the end of the game. There is no chance after Adam's turn 14 that Psyduck can buy two Provinces without Adam scoring any more points, which is what needed to happen. Just to emphasize, Psyduck needed to buy the Provinces because Rebuilding Duchies could not net enough points.
I would play the engine here, but I would get at least one Jack if I was trying the Rebuild strategy because FV/Jack is awesome, the defense against Margrave is good, the estate trashing (at least 1-2) is still good (it's faster to buy $5s, not Rebuild all your estates), and the economy boost is useful to buy Rebuild. You can't really complain that Psyduck didn't get Scavenger soon enough, he bought one turn 3! I would have liked to seen Psyduck buy another FV instead of Silver on Turn 4. Maybe second Scavenger over second Jack. But really Rebuild just looks slower than the engine.