It's possible that people are realizing that all the newer AIIMS have different strengths as they're growing rapidly in various fields. For instance, the department at AIIMS Nagpur might be better than the same department at AIIMS Raipur, while another department at Raipur could be ahead of Nagpur's. Also, being close to family or choosing a city that suits one's preferences is becoming a bigger factor, especially with recent incidents like attacks and suicides.
When it comes to cities, Nagpur and Rajkot might offer a better lifestyle, food options, nearby attractions, and connectivity compared to Raipur. Plus, medical career growth isn't solely dependent on where you did your undergrad or postgrad; it's a journey that continues throughout your life.