There is a marine who’s followed Luffy throughout the oceans though and nearly killed him multiple times tho?
Koby Is:
- Garp's own disciple (and that Is a parallel to Luffy-Ray and Zoro-Mihawk too);
- has his own epithet;
- use Garp's own moves;
- Is called by Garp the future of the Marines;
And so on.
Smoker on the other hand fits the bill mostly for what he did in Alabasta, but lacked everything else.
And today's panel was pretty straightforward about who Is more important for Oda.
A shame, becasue even in the Golden era there were at least two big Marines. Still, It Is what It Is.
Maybe Fujitora fits that bill.