He clearly going to be used as a bargaining chip, a much more efficient one Koby.
Garp is a whole ass symbol and the WG knows it.
Thing is I doubt Oda ever planned to go through with that plot. To me it was more like an excuse to kidnap Koby and bring Garp to Hachinosu. I can even see everyone going home and nothing coming out of this arc.

BB being officially accepted by the WG feels kinda useless to me.
 
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