1. does it allow madara to multi-spawn rinbo versions of himself ?
-personally I don't think so. I came up with this question just because madara knocked out 9 bijuus almost
instantly but then we are all aware of how madara could've just speed-blitzed them...
2.could it have been the mysterious jutsu that held sasuke in mid-air?
-I don't think it's rinbo that's doing the work...http://narutobase.net/manga/Naruto/661/20
Rinbo creates an invisible version of madara , who would have physically grabbed sasuke in mid-air . however we can't see any signs in this scan that indicates sauce is being held physically by an invisible entity. his shirt and flesh look perfectly normal, free of any compression except for the part where his blade pierced through...
3.is it PnJ that madara didn't use it to take back his left eye?
-Yes ,imo. madara says he'd avoid using rinbo/ringa because obito still has his rinnegan http://narutobase.net/manga/Naruto/666/14 , my interpretation would be that he thought rinbo would be so OP that the rinnegan would be damaged . however , his rinbo could have just taken out obito's rinnegan by surprise and brute force , much like how danzo did it to sushi in the filler. I don't see how it could do much damage to the eye...there are other reasons to account for his choice tho....this method carries the risk that the eye could still be damaged by kakashi and others once it's been taken out and suspend in mid-air
I'm afraid my condition has left me COLD to your pleas of mercy
Re: some questions regarding rinbo hengoku
1 that a good question to which I have no idea
2 50/50 on it being rinbo doing that or not (he never say anything he just turn around to look at sasuke and sasuke stop dead in the air)
3 I think Madara didn't use it maybe because just like sasuke, obito would have saw it too