It seems to make sense to me. Granted, what's been said isn't exact, but I'm assuming it just means that the follow-ups don't necessarily have higher per-execute potency than the opener. They'll still have higher per-execute contribution though.
Our typical combos:
Full Thrust - 150 potency
Vorpal - 100 (C.B. 200)
Full - 100 (C.B. 360)
These combos:
<> Tachi - 220 potency
Kazekiri - 100 potency (C.B. 180) - Grants attack speed
Raikiri - 100 potency (C.B. 170) - Makes your direct damage attacks immune (or 10% resistant) to typal (e.g. Slashing) resistances.
OR: Saikiri - 100 potency (C.B. 150) - Causes your next to attack twice.
OR: Hisaku - 100 potency (C.B. 110 AoE) - Causes your next attack to cleave for split damage, + (diminishing) bonus per target hit.
etc., etc.
Tachi remains your individually "strongest" ability. Spammed, it does mediocre damage. Taking advantage of follow-ups and cycling back around, it does a whole lot more.
That said, I don't especially see why this would be necessary. There's also a reason every single job does a 150 (or less) opener; at first, as not to take from the tank's first hit, as Bloodletters before the first enmity-enhanced move, etc., are want to do.
