I did, obito. He can sesne chakra from other dimensions something karin was never shown to do. He even claimed he could find anyone.
I need scans to understand what you are talking about. And was that Pre-rikodou or Post-rikodou Obito?
Really, despite being a non transmigrant? Does that mean that shisui's chakra potency for example was more potent than hebi sasuke's as well? What do you mean by mature, as in itachi being more experienced?
Actually, due to being a transmigrant, Sasuke has innately larger and more powerful reserves as compared to Itachi at the same level. But as we already discussed, Sasuke's chakra gradually comes to Indra's level. So that means it's larger and stronger with respect to his age, but not necessarily the largest and strongest in the clan initially.
And while Itachi has lower and less powerful chakra reserves naturally, his progression is a lot greater compared to Hebi Sasuke.
1. Itachi had MS. A higher dojutsu is illustrative of larger and stronger chakra reserves.
2. As time passes, your chakra grows in quantity and quality, called chakra maturing, and considering Itachi was quite a bit older than Sasuke, his chakra was considerably more matured than Sasuke.
3. Honing of physical and mental capabilities result in increased physical and spiritual energies respectively resulting in a stronger and greater chakra. Itachi excelled in this as well.
So all these reasons combined put MS Itachi above Hebi Sasuke in chakra.
I believe post rikudo sasuke has both stronger and larger reserves than any bijuu. As far as potency of chakra for a non rikudo sasuke that's not easy to say. No one knows how powerful indra's chakra was, it is an assumption to believe sasuke even with EMS could match someone who was the son of the sage himself.
This has already been addressed. Sasuke's chakra is initially not Indra's level, it needs to fully mature to come to that level like Madara, and for that he has to reach adulthood at least. Even with EMS, Sasuke couldn't match Indra because his chakra wasn't matured enough.
They are, it explains why amaterasu was able to mix with FRS in the right ratio despite the large chakra difference between KCM naruto and EMS sasuke. Sasuke's regular jutsu like chidori could never match the chakra of a FRS.
Large chakra difference between KCM Naruto and EMS Sasuke doesn't mean every technique they produce will also have a similarly large power difference.
Also, collaboration jutsu doesn't require same power from both sides.
Look at how powerful sasuke's chidori became when amplified by an eye technique like susanoo.
It wasn't amplified by Susanoo. It was amplified by Rikodou chakra and
channeled through Susanoo.
I think this is enough evidence to show that while uchiha have strong chakra, eye techniques help a great deal in toning down the amount of chakra consumed.
As I explained, that's not really the case. Uchiha's superior chakra quality make it seem like their techniques are consuming less chakra. Eye techniques may consume comparatively less chakra, but not that big a margin. And for Uchihas in general, all their jutsu consume very little chakra due to their chakra quality.