I wrote a very long post and got timed out
Not going to write an essay again.
Saina and Leander are overrated on here given the forum's history (never been a top 20 player and doubles doesn't count). They can't claim to have inspired anyone either. Mahesh actually gets some kudos for Sumit and Kamran.
Objective criteria,
Low participation individual sport (most Olympic sports) - best in the world
Medium participation individual sport (badminton, chess, pro boxing, motorsport) - top 3 in the world
High participation individual sport (sprinting, tennis, golf) - top 10 in the world
Low participation team sport (field hockey) - best in the world
Medium participation team sport (cricket, rugby, volleyball) - top 5 in the world
High participation team sport (football, basketball) - top 20 in the world
Off this criteria, we get
Bindra
Sindhu, Saina, Padukone
Anand
Milkha Singh, PT Usha
Ramanathan Krishnan*
Dhyan Chand
Gavaskar, Kapil Dev, Tendulkar, Dravid, Sehwag, Dhoni, Kohli, Ashwin
Add another objective filter in terms of longevity and being undisputedly meeting those criteria for at least 3 years, we are left with
Sindhu, Saina, Anand, Dhyan Chand, Gavaskar, Tendulkar, Dhoni, Kohli
Add another filter that you should have been the best in the world at least one year, we are left with a smaller group of 5 who all have some criticisms against them
Sindhu
con - not consistent in smaller tournaments, never been #1
pro - 2nd best player in women over the last 5 years (win the OG next year and she will be the best player of her generation)
Anand
con - terrible record against Kasparov
pro - 5th/6th in GOAT rankings, 4-time undisputed world champion, top 10 for 3 decades
Dhyan Chand
con - prehistoric era
pro - considered the Don Bradman / Babe Ruth of field hockey
Tendulkar
con - not considered a match winner
pro - holder of most runs records of all kinds
Kohli
con - choker in big tournaments
pro - phenomenal consistency
Not an obvious pick between these 5 imo.