The calc from TYBW gets it up to trillions of degrees, but the Getsuga Tenshou up scales as when Ichigo fired it at Yhwach, his arm was more scortched (he was holding Yhwach and fired the GT point blank).
Yeah.
Yes. Not sure if I believe in TSO being EE, but even if they are, under the same credit, Aizen's passive Reiatsu is also EE and Ichigo resists that, Mugetsu is also EE and Ichigo wears that same Reiatsu on his body. Power null also isn't an issue as his spiritual pressure bypasses Seki Sekki material, which breaks apart spiritual energy.
On that note, Naruto may have flawless Taijusu, but Byakuya is also stated to have no shortcoming in his fighting style, yet Ichigo would surpass him eventually.
Other things Naruto won't resist outside of the heat manipulation, he won't be capable of resisting spatial manipulation like when Ichigo cut space to both escape Yukio's dimension with Reiatsu when transforming into Bankai and when he went to attack Aizen from behind, the passive Hollow poison (Naruto can only take so much of it), energy absorption (which actually gives Naruto trouble), and other things like if Ichigo has it, he can just destroy Naruto at a level above molecular deconstruction with Kenpachi's passive Reiatsu, or with enough Reiatsu, he can bypass Naruto's defenses and attack internal organs (like what Hikone did), BFR Naruto's soul to Soul Society and leave him there.
Just other things to put on the table.
His evolution will also help, which is funny someone mentioned the Askin instance cause he lowered Ichigo's tolerance to Reishi, yet Ichigo was able to recover from that despite Orihime not going over to heal him, so his evolution is so good it can overcome a level of resistance negation.
