Perhaps he intentionally got karin pregnant to mix uchiha and uzimaki bloodlines. Perhaps like minato, sasuke was aware of some impending danger to the world and sarada will awaken a "new power" to stop it given her ancestry. And also perhaps sakura was reluctantly in on it the whole time.
Those were real sharingans. A projected Sharingan on a animal summon or person merely indicates they are under the control of that sharingan user. And somone being controled by sharingan cannot use Sharingan abilities. Like the basic abilities the altered Jins could use. (fighting move...
I would say that the Rennigans are projections. Just like Nagato used. But those Sharingan are implants. If the sharingans in the Jins were projections from Tobi, then they should have been teleporting all over the place.
Itachi's MS "went blind" b4 he died. but Sasuke still was able to get EMS after the TRANSPLANT of Itachi's eyes. That proves that the eye going blind does not matter when trasplanting for EMS
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Was stated to...
If Madara was in the eye implant mood with the previous 7 Jinchurikis. Why didnt he implant Sasukes old eyes into Edo Itachi to give him the EMS? That would have really boosted their battle power.
Naruto, the son of the previous jinkurichi, was born with the 9 tails whiskers on his face, which indicates some kurama juice in him from birth. Would he have been kick ass still without the 9 tails sealed inside him? His kids have the whiskers too now.