Well with respect to rivalry which does and will impact legacy, that wasn't the question. The question was "is it Kerr or Hocker" So you answered that the same way I did in saying Hocker can, because on the flipside I don't see that with 28 year old Josh Kerr anymore.
With respect to Hocker winning races, if I'm honest, all that really matters are the world championships and Olympics and especially now in the era of wavelight in every DL race (including the DL final) which has unfairly tilted the field towards timetrial specialists and not racing specialists - something which the great race tacticians don't have reciprocally. So Jakobs 95% winning percentage in Euro/DL one day meets is something nice, but something I would take with a grain of salt.
Hocker won't break any outdoor WR's. He's not built to run under 3.26.00, 3.43.13, 7.17.55 or 12.35.36. Jakob is (not the 1500m but it would seem like the mile and 5000m are possible), but the big unknown now is have the years and years of high volume threshold stacking and steps on a track/treadmill (now in stupid high-stack, soft foam shoes that are wrecking him) finally caught up with him. Jakobs records are all incredible performances (2000, 3000, 2mile) but none of those distances are as prestigious or meaningful as the 1500m, mile or 5000m and I really think he needs to get at least one of these records to counter the emergence of Hocker and his racing ability and instincts.
So as much as Jakob fan-boys don't want to hear this, there is a possibility that his window for breaking records (which was closing anyway just based on what we have seen historically for the last 40+ years of elite runners) might actually be already closed and his record breaking days are over. He might have 2026 depending on how well he's recovered mentally and physically, he might simply not.
Now let's think about Beijing in 2027. Hocker a year younger than Jakob at 26, Jakob an old 27 - it's not inconceivable that Hocker could win the 15-5k double and do the one thing Jakob never could at this level. I mean he could have done it this year if he hadn't run like a putz in the semi-final and mastered his own demise there. There is nobody else on the planet that can do this. I certainly don't see any other potential 1500m candidate moving up in 24 months time to be able to do both. Laros? I doubt it. Nader, Koech, Kessler, Ethan Strand? No. So Hocker could do a few things Jakob never could - win a world 1500m title and win that 15-5 major championships double which is so legendarily hard to do.
I don't know man - if that went down, I would struggle to definitively put Jakob ahead of Cole in this decade, irrespective of the DL wins/WR's at non-traditional distances/and his medals. This isn't even entertaining what Hocker could do at a home Olympics in 2028.
Back to the original question - the answer isn't even close.