Let's use logic.

How long has coby been training in the entirety of the series?

2 years and 6 weeks. Your entire point is irrelevant when oda had this dude with 0 fighting ability be this strong in 2 years.

Luffy trained for 10 years before starting his crew and then another 2 years which makes it 12 in total. So the logic you are trying to spew with odas writing clearly does not apply to coby lol
And what has his training actually resulted in? What feats does he have to show for it?

Getting one punched by pre skip luffy?

Getting easily captured and needing rescue?

Not being able to even break a simple ball and chain?

Getting tricked by some fodder even though he is supposed to have broken coo?

Enlighten me
 
I just realized that Oda created a multiple chapter plotline with characters like Garp and Kuzan just to hype up Coby:

Garp: Coby's mentor from the old gen
Kuzan: Garp's Coby before Coby existed
Sword members: Coby's crew
Hibari: Coby's wife

Oda dedicated a major plotline in the final saga with Coby as the MC. He is more important than 99% of your favorite characters
 
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