Would've been the strongest character but a shonen has no need for a sense of time. Kakuzu has lived over a hundred years and should posses jutsu beyond Kamui and Kirin in the realms of teleportation and AoE destruction. There is nobody who can surpass Kakuzu as a ninja, but the Naruto series would have you believing a main
I understand what you mean but I don't quite see how it's anything like invis
Since it is an automatic rebelling item, even if i hook onto a nearby tower and rebel there's a couple problems I would face
1. The hooks are bright white lines protruding from a T, they are extremely visible for the most part
2. If you've ever tried to hook onto something mid range-far away you will find it takes a significant amount of time for the hook to reach its mark.
3. Even if you do reach your mark and start flying away, you will most likely be shot at by at least 1 CT for that decent amount of time you spend flying towards your target.
I'd definitely agree that it could be OP in some scenarios, but that can be helped by increasing the price to allow for high risk high reward situations. If anything, its like a slower but more accurate version of the jetpack, an already existing item that allows you to fly anywhere across the map if used correctly.
Worst case scenario we can put it on there, and if it causes any problems we just tweak or remove it from the T shop.