Well only a couple of threads on this guy which is shocking given that I'm going to guess absolutely nobody picked him to even medal in these games (Rojo can we check the comp and see if anyone even picked a bronze?). A lot of talk about what might be going on but I haven't seen anyone post these numbers yet because in track and field, one of the only things that can be definitively fact is what athletes actually run on the track.
Jacobs career progression at the 100m:
2011 11.19 Chiari (ITA) 20 MAY 2011
2012 10.68 Campi Bisenzio (ITA) 19 MAY 2012
2013 11.19 Chiasso (SUI) 19 AUG 2013
2014 10.53 Gavardo (ITA) 18 MAY 2014
2016 10.23 Savona (ITA) 25 MAY 2016
2017 10.82 Trieste (ITA) 30 JUN 2017
2018 10.08 Savona (ITA) 23 MAY 2018
2019 10.03 Padova (ITA) 16 JUL 2019
2020 10.10 Stadio Giuseppe Grezar, Trieste (ITA) 01 AUG 2020
2021 9.80 Olympic Stadium, Tokyo (JPN) 01 AUG 2021
He ran 10.68 as a junior (18) - the standard for the World Juniors that year in Barcelona was 10.64 so talent wise I don't know how we rate this - for me personally this doesn't point to any indicator of the kind of talent you need to win the Olympic 100m given the ability of Bolt as a junior (19.93 at 18) or even Gatlin (10.36 at 18). At the age of 20 Maurice Greene ran 10.19 , Gatlin 10.08 and Bolt 10.13 . Jacobs 10.53
Obviously 2018,19 and 20 things start looking a little better - he becomes a 10-low runner so let's analyze some facts/data.
If we continue looking at those 3 Olympic 100m champions since the year 2000, Greene ran his PR at the age of 24 (9.79), Gatlin ran his PR at the age of 23 (9.77) and Bolt his PR at the age of 22 (9.58) but this was just 6 days before his 23rd birthday. At the age of 24 Jacobs had run 10.08 - around 4 tenths of a second slower than the club of Olympic champions since the turn of the century he just joined. What is interesting is that this progression between age 20 and when Bolt, Gatlin, Greene ran their PRs is very consistent - it's around 0.40 seconds at 20 and the same when those 3 hit their career peaks compared to Jacobs at the same age.
Somehow at the age of 26, Jacobs managed to drop a staggering 0.28 seconds of his career best and a full 0.30 seconds off his 2020 best performance (let's look at 2020 in a second). To put that in context at the age of 26, Bolt had regressed marginally to 9.63, Gatlin 10.03 (though he did run 9.87 just after turning 27) and Greene 9.86. Not huge regressions from their best but something (0.05 to 0.13 seconds).
If we want to think the COVID affected 2020 season was something that halted us seeing that improvement from 10.03 down to 9.80, the fact is he ran a surprising 15 100m races outdoors in 2020 with a best time of 10.10 with almost all in the 10.10-10.30 range. All these numbers easily found on his WA profile (same for the Bolt, Gatlin, Greene data).
https://www.worldathletics.org/athletes/italy/lamont-marcell-jacobs-14453864
So everyone, draw your own conclusions from these facts - the man that succeeded Usain Bolt as the Olympic Champion. No further comments.