1. Koby trains with sengoku. Both have impact attacks. Garp trained koby to be the new hero of the marines while sengoku trains him to be a future fleet admiral

2. Helmeppo trains with the male Vice admiral that was nominated to be an Admiral

3. Grus trains with female vice admiral that was nominated to be an admiral

4. Kijaku and Hibari trains with tsuru.

5 Tashig trains with Momonga. Both have swords

6. Smoker trains with Xdrake. Both became irrelevant and need to step their games up. Both could help each other achieve devil fruit awakening
 
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