Gotta say I really like this about Garp, the guard dog thing makes a lot of sense and he's also the "old guard" in current day too. It also explains his dog symbolism truly too and maybe why some of the VAs are dog themed too. Also Garp when he was trying to save Koby, had that flashback where he said the important thing was to leave the old ones behind, the youth is the future and must survive or w/e, which also harkens to what the Japanese like to believe in, "Shinjidai" IIRC? Oh wait Uta had a song by that name, how fitting lol.
I do wonder how this relates to Akainu though, similar fighting style and a dog theme. Some something dogmatic/dogma too lol.
I have enjoyed the characterisation of Garp and Roger somewhat in this flashback, but I also dislike a lot of what Oda did with Roger here too. At least we're finally getting to know much more about them, for better and for worse though.
I don't have faith in Oda to deliver with Rouge and whoever Dragon's and Luffy's mothers are at this point though, given what he did to the mother of Shanks and Shamrock of all characters. I'm still floored that Oda would be so spitefully neglectful with writing the mother of Shanks, his own self insert/most worshipped character. Its nauseatingly confusing.
I expected to see some of the Rocks Pirates fall and thus die on GV and that would have made their betrayal, their lack of loyalty make even more sense, why they fled and abandoned Xebec. Xebec didn't deserve to go down like that, especially all alone too but I expected exactly that to happen and it's a damn shame seeing it happen canonically now.
I know they all had their own agendas and most weren't truly loyal to him but they stayed loyal enough to not mutiny and follow him to God Valley regardless, even if it was to serve themselves though. It's also bitterly ironic that the strongest crew were the weakest team too.
Can't wait for Blackbeard's storyline and arc even more now especially. I'm glad Garp secretly freed Dragon and let him go, I wish he had been that more proactive when Ace was captured but its understandable why he wasn't either. But he still let Ace die too though. Roger's (allegedly) only son and thus child at that .
I also respect Oda for not making Xebec just a cliché fully evil and crazy bastard and thus lacking depth potentially and therefore giving this nuance and tragedy to him too, showing he truly cares and respects about not only his own family but even his crew and Roger and Garp surprisingly too. Kinda reminds me of how Blackbeard was worried for the safety of his original crew members when they faced Ace too. Definitely a bit of Xebec influence there at least.
Some bonus stuff to add to this too:
1. The "New Era" (Shinjidai) Ideal
In Japanese culture and media, there is a profound reverence for the concept of the
"Next Generation". The role of the elder (Senpai/Sensei/Parent) is ultimately to serve as a foundation—or a sacrifice—so the youth can surpass them.
- Garp’s True Code: If we look at Garp through this lens, his "Justice" isn't about laws; it's about Survival of the Bloodline/Future.
- Saving Dragon: He frees Dragon because Dragon is his son—the literal future. Even if Dragon is a "criminal" in the eyes of the law, he is the "youth" that must survive.
- Saving Koby (Hachinosu): Fast forward to the recent battles (Hachinosu), Garp literally sacrifices himself to save Koby, explicitly calling Koby and the SWORD members the "Future of the Marines." He walks the walk.
2. The Tragedy of Ace (The Exception)
This makes the death of Ace even more tragic and confusing for Garp.
- Ace was the "youth," but Ace was also tied to the "Old Era" (Roger).
- The World Government wanted to kill Ace specifically to end the "Old Era" bloodline.
- Garp was paralyzed because he was stuck between his duty to the Organization (which maintains order for the future) and his love for the Individual (Ace).
- In the end, Garp failed the "Japanese ideal" with Ace, and that failure is likely what broke him, leading to him betting everything on Luffy and Koby later.
3. "Inherited Will"
You mentioned "what the Japanese like to believe in." In
One Piece, this is textually described as
Inherited Will.
- You don't have to live forever; you just have to pass the torch.
- Xebec -> Blackbeard
- Roger -> Shanks -> Luffy
- Garp -> Dragon -> (Revolutionaries) or Garp -> Koby -> (New Marines)
By freeing Dragon in this chapter, Garp was subconsciously ensuring that the "Will of the D" survived, even if he couldn't join the revolution himself. He acted as the "Guard Dog" opening the gate for the puppy to run free, while he stayed chained to the doghouse.
Verdict: Your read is spot on. Garp acts on the instinct that
the young must outlive the old. His tragedy is that he realized it too late with Ace, but he got it right with Dragon (as seen in 1166) and Koby.
Factoring this in too, that's also why Garp wants to be a guard dog for the younger Marines and thus what we saw with him and Koby. Its like the Konoha teachers or All Might with Deku and his classmates for example. Protect the young, protect the future. Thinking ahead/long term/generationally or w/e.
Learning, knowing and understanding themes like this and such does make me appreciate and enjoy OP and other stories a lot more tbf.