I can only answer the 3rd question, the last time we have Fukurokumaru Deals, the featured ninja in that event was Edo Deidara .. I remember it clearly since i was able to hit the 5k rebate where i got 10 Edo Deidara fragments and other items like Charms and Magatama Box maybe ..

Yeah, spending while Fukurokumaru Deals is on is a such great move, you will earn many stuff and a complete set of a ninja .. The only problem here is, if the available event with fukurokumaru deals is worth spending or if the thing or ninja you wanted is in one of the events together with the fuku deals ..

No, impossible .. They will never release two spending rebate at the same time, we have the Daily Recharge, Total Spending Rebate and Crazy Slot Machine this cycle and they're all full cycle events .. Maybe next cycle it will come ..