The seven men in the conversation (assuming you DQ Kiprop and Manangoi) are, in order of 2010-2019 PB:
Silas Kiplagat 3:27.64
- 2nd Daegu 2011, 5th Beijing 2015, 6th Moscow 2013, 7th London 2012
- 15 Diamond League 1500/mile wins (2 DL Finals)
- 2010 Commonwealth Games gold
- 4 sub-3:30s
Timothy Cheruiyot 3:28.41
- 1st Doha 2019, 2nd London 2017, 7th Beijing 2015
- 20 Diamond League 1500/mile wins (4 DL Finals)
- 6 sub-3:30s
Taoufik Makhloufi 3:28.75
- 1st London 2012, 2nd Rio 2016, 2nd Doha 2019, 4th Beijing 2015
- 1 Diamond League 1500/mile win (1 DL Final)
- 1 sub-3:30
Abdelaati Iguider 3:28.79
- 3rd London 2012, 3rd Beijing 2015, 5th Daegu 2011, 5th Rio 2016
- World Indoor gold 2012, World Indoor silver 2010, World Indoor bronze 2014 & 2018
- 0 Diamond League 1500/mile wins
- 2 sub-3:30s
Ayanleh Souleiman 3:29.58
- 4th Rio 2016
- World Indoor gold 2014
- 7 Diamond League 1500/mile wins
- 1 sub-3:30
Nick Willis 3:29.66
- 3rd Rio 2016, 6th Beijing 2015, 7th London 2017
- World Indoor bronze 2016
- 0 Diamond League 1500/mile wins
- 2 sub-3:30s
Matt Centrowitz 3:30.40
- 1st Rio 2016, 2nd Moscow 2013, 3rd Daegu 2011, 4th London 2012, 8th Beijing 2015, 8th Doha 2019
- World Indoor gold 2016
- 1 Diamond League 1500/mile win
- 0 sub-3:30s
…
There are probably some people who would rank Centro outside the top 5 based on their personal criteria, but I think it’s fair to say he’s one of only 3-4 men with a legitimate argument for being the greatest of the decade.
I hadn’t thought about this initially, but even though he came in halfway through the decade Cheruiyot has a strong case for being #1. Look at all the DL/DL Final wins, the 6 sub-3:30s, the PB 2 seconds faster than Centro’s, the World Championship gold and silver - plus, I think his 2019 gold medal run is probably the single finest 1500 performance of the decade.