Honestly, I don't know when the TYBW manga starts. But you could search manga databases or ask in manga enthusiast communities to get the details you need.
Another alternative could be fanfiction that focuses on Grimmjow's backstory. How he became a powerful Arrancar, his experiences in Hueco Mundo before coming to the human world. This can add more depth to his character in a positive and appropriate way.
The TYBW arc's starting chapter isn't a straightforward answer. It could be different based on the manga version and region. I suggest looking at dedicated manga websites or asking fellow manga enthusiasts for the exact chapter.
I'd suggest checking manga forums or dedicated Bleach fan sites. They often have detailed breakdowns and recommendations on where to pick up after a specific part. Sometimes, the author or official sources might provide cues as well.
Grimmjow's high - speed movement would be a great asset in the Naruto world. He could outpace many ninjas. His reiatsu - based attacks could be seen as a new form of energy - based jutsu. For example, his Cero could be like a super - powered ninjutsu blast. His ability to regenerate quickly would also give him an edge in battles against ninjas who don't have such a power.