I guess BB and Luffy aren't a good example then. But the point still stands. There is no rule for oda to make some one closer to luffys age his "Garp".
The purpose of making smoker older than luffy is, to contrast with him. Luffy is a super young kid with a naive positive outlook of the world. Smoker is the exact opposite. If oda made a yound kid luffys rival in the Marines, it just wouldn't work. Cause the rival would be too inexperienced and naive too.
Also, are you saying coby will get a df? I thought you were against it lol.
Nah garp was never portrayed as needing to be someone super rule oriented lol.
Smoker being more mature doesn't mean much since coby has shown more mature thingd on paper. He would technically be the one that elevated quickly in position and notoriety in the marines which makes his potential and maturity more than smoker.
Explain to me this:
How could Smoker be more mature when he and coby went into the new world at the same time? How exactly is he more mature than coby when in 2 years coby wields a rank higher than his (smokers) prerineskip ever since Smoker been in the marines? The sbs stated that marine captains at marine hq are more powerful and more experience than marine captains located else where. To be exact marine hq captains are 4 ranks higher than the marines captains located else where. They are also more experienced.
Is Smoker experience fighting or being in the presence of a yonko? No.
What ever experience Smoker has c9by currently has: leading people of lower rank, sailing the new world with subordinates. Hell coby on paper has more experience protecting people for the reverie. Something Smoker has never been shown doing. So the experience you speak of don't exist