That is not true at all , the 3 admirals have way more killing power .
The 3 admirals have much better defence due to being Logia users and have
far superior hand to hand skills.
Next to that wouldn't it surprise me if at least 2 out of 3 admirals could resist the potion due to the nature of their logia power.
however when it comes to purely talking about the DF in terms of how easily it can
kill someone, or a group when the person using it has equal skill? Sorry, Magellan wins hands down.
Remember that time when Aokiji attacked the straw hats and froze half of them over? That didn't inflict much permanent damage, did it? Magellan would've
poisoned every single person touched in that fight.
And not just that, he also would've
poisoned every single one who touched the poison-covered people.
The strawhats would've ended right there.
In the same vein, as powerful as Akainu is, most people who got hit by him in a non-lethal way got a nasty scar or wound, but hey, they still lived without ivankov's hax hormone powers.
Magellan's power is
almost literally you touch it
in any way at all, you die, that's a pretty damn intense sheer killing potential.
.
Even someone like Handcock hit you with arrow you dead .
We've seen plenty of strong willed people survive Hancock's power with ease, her power is only instant kill against low level baddies.
The
only counter we've seen against Magellan is Ivankov's deus ex machina power.