Alright, thanks for clarifying a few things. I'm just gonna ask a few more questions, hope you don't mind. Again I'm no expert in this.
Its invisible and yes it does
The scans clearly show its bending space, and if it is invisible, why would it need to be shown?
No the invisible/black portion would be that
almost inside would make it not FTL as it isn’t fully inside
How do you know the black portion would be that? The black portion is a ripple wormhole-like entity that acts as the black hole itself, not the event horizon. This can be pointed out as the event horizon would be a three-dimensional spherical-like area surrounding the black hole no? Even if it was contained?
Light is bent towards it even when it can theoretically escape, light is bent under all gravity. Tsuna escaped when he wasn’t fully past it.
Right, but this is in the assumption Tsuna isn't on the event horizon even though the stars collapsed with him at extremely close proximity. What makes you so certain this isn't the event horizon?
All points seem to indicate the fact that it is.
Yes Light is drawn towards it however shine a flashlight from the edge of the event horizon away from it and the light will escape, here the light is already going in the general direction of the black hole, it just needs to be bent towards it.
The problem here is that all light from all directions seems to be sucked into the black hole, none of it escaping, which would make this as you've stated, the event horizon. Since light from all directions bends toward it. With one image even showing light in other routes bending to the gravity center without being able to escape.
No light is drawn towards it even before you reach the event horizon
I imagine you mean here that "Light is drawn towards it, even before you reach the event horizon" however if this were the case, then why is all the light going toward the black hole, and not just bending around it, since you've stated if it is not in the event horizon it can escape. The art depicts all light, in all directions going into the black hole simultaneously, which from the examples you've stated seem to suggest he is in the event horizon.
I am confused why this situation cannot be an event horizon, it seems to meet all the qualifications you've stated.
1) Space is clearly being bent as is shown in scans
2) All light is directed to the black hole and cannot escape, no light is shown escaping where tsuna is, and light in fact is all going directly toward the black hole. Was he not on the event horizon? -- as you've stated -- some of the light could have escaped, however Reborn and Gokudera support this claim stating no light can escape the black holes, and the fact no light is actually shown escaping.
All of these points are being used in tandem with your explanations, and logic along with the scans provided. However the only point you have against this is the assumption that the black ripples drawn are the event horizons, even though all your qualifications are met when looking where Tsuna is.