I believe (judging from his very positive tweets) that Jim has seen it and is working on an ‘official’ analysis.
That aside, I agree with Saving the Multi-verse and Miles Morales as OS and MC. My guess is that the IC is Peter B. Parker. There’s a possibility that it’s all of the other Spider-people too, but I think his bond with Peter B. Parker is the strongest of them all. They have the ‘you and I are both alike’ at the graveyard, and Peter’s influence is very much about pushing Miles to take that ‘leap of faith’, regardless of his worries or anxieties. There are a few other characters who take on that mantle before he turns up (MJ; Chris Pine Spider-Man), but he feels like the consistent holder of that perspective.
And their relationship of mentor-mentee is the clearest for me out of the whole movie. I didn’t feel his Dad really had too much of an overriding ‘influence’, but there were definitely a moment or two where he acknowledged that he was pushing his son to be something greater, which perhaps could fall under the IC perspective. But that partnership of new Spidey and old Spidey felt very strong to me.
Also: best post-credits ever.