Why is that? lol
It's natural for our main characters to power up, Sanji got his raid suit and power up, so we're more than satisfied lol
And who knows, maybe the constant use of Raid Suit which is activated by Sanji ONLY "meaning his DNA/lineage factor" may end up playing part in provoking Sanji's gene, and somehow awake the dormant genes that were supressed by his mom medicine! Ending up making Sanji develop even an exoskeleton and other powers related to his genes...etc!
naturally Oda will have Sanji control his emotions unlike his brothers lol
But anyway, Sanji already got a power up, and there is still possibility for more comsidering the experiment made on him.
Oda wouldn't throw that just to ignore it later, they are just seeds he planted for future power ups when time is right to awaken it
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Yeah, but it's not like Zoro tamed it completely, even Zoro himself said that he needs more time with it
But even still, I wanted a little bit more time and showcase from Zoro infront of Kawamatsu's eyes to start making compliments. C'mon! does it feel weird how fast he switched!