Maybe you didn't think about the following cases:

If jonin minato is paralysed never gets any boost since can't trigger a combo. If hokage is paralysed doesn't change anything for him.

If jonin minato is in front of an evading ninja doesn't get the chance to deliver the 6 combos and so to reduce the cd of the mystery and so to start the combo if is the only available ninja that could do it. Hokage minato in this case still get two boosts thanks to pakura, jonin 0.

If jonin minato is in front of a super armor ninja needs to start the combo with mystery otherwise don't get the boost. Hokage minato in this case still get two boosts even if is acupunctured or if there's 0 chakra available.

In general what Zelgadis says is that's way easier for jonin minato to not be at 96% boost in round 4 than for hokage if both are together with pakura.

the only situation where hokage gets less boosts than jonin is if both of them are blinded and jonin chase is linked to another ninja that is in the condition to let him chase twice, but if jonin is blinded the cd of the mystery doesn't get reduced, so the bigged boost has to be compared to the missing resistance boost jonin doesn't have, so more or less even in this case hokage slightly wins since grants more survivalability to the whole team.

Seems to me right to say that a furthermore big advantage of hokage in comparison with jonin that Zelgadis forgot to say is that if hokage is in front of evading ninjas the free attacks he lands with the passive can let the evasion proc before using the mystery itself. It's not a little advantage nowadays, overall in close battles where you are left with 1-2 ninjas vs 1-2 ninjas. Hokage is sure to deliver the damage earlier even without owning initiative.

What i'm saying is, lets say you are left with hokage minato vs an higher initiative shisui, masked man or jonin minato in a 1vs1 battle. If minato is boosted enough to nuke them with mystery even if you don't own initiative you kill the enemy while with jonin you don't do it.